By Christina Mathieson, LMFT #115093, founder of My Mental Climb.
TL;DR. A boundary is a limit on your own behavior (what you will do or not do) to protect your health, values, or capacity. Selfishness dressed up as a boundary is a demand that someone else change to maximize your comfort. The same words can be either, depending on whether they control you or control them. The cultural shorthand around "setting boundaries" has lost this distinction, which is why so much current boundary advice produces more relational damage than less. This post is the clinical version, with examples across seven relationship contexts (including parenting young kids, drawing on Dr. Becky Kennedy's framework). A printable handout summarizing the same framework is at the bottom.
If you have spent any time on TikTok or Instagram in the last few years, you have encountered the cultural script around "setting boundaries." Some of what circulates is genuinely useful clinical content, and a lot of it is not. The mismatch between what boundary-setting actually looks like in therapy and what gets sold as boundaries online regularly comes up with new clients.
This is the clinical version, with the distinction that matters.
The cultural confusion
The version of boundaries that has dominated the last few years usually sounds something like: "I am setting a boundary that you cannot speak to me that way," or "It is my boundary that you do not talk about that subject around me," or on the more performative end, "My boundary is that you respect my time."
Each of those sentences sounds like a boundary, but none actually is one.
The reason is structural: each of those sentences is a rule about what the other person has to do, which is not a boundary but a demand, an ultimatum, or a wish depending on the context. A boundary, in the clinical sense, is a limit on what you will do, where the grammar is "I will" or "I won't," not "you will" or "you can't."
This isn't pedantry; the distinction changes what is possible in the conversation, who has to do what, and whether the relationship can survive the exchange.
The clinical definition
A boundary is a limit on your own behavior (what you will do, what you will not do, where you will be, when you will leave, what you will engage with) that you set to protect your health, your values, or your capacity. The goal is usually to preserve the relationship in a workable form rather than to end it. The person enforcing the boundary is the same person whose behavior is being constrained: you.
A few examples of the structure:
- "I am not going to discuss my weight at family dinners. If it comes up, I will step out for a bit."
- "I will not respond to work emails after 7pm or on weekends."
- "I will end the call if we keep going down this road."
- "I am not lending money this month."
- "I will not stay in the room when the yelling starts."
Notice the pattern: the subject of each sentence is "I," the verb describes what I am doing or not doing, and the other person retains full agency to continue whatever they were doing while my response is what changes.
By contrast, a few examples of what gets called a boundary but is not one:
- "You cannot bring up my weight when we are together."
- "Stop emailing me on weekends."
- "You have to drop this subject right now."
- "You should be willing to lend me money this month."
- "Stop yelling at me."
Each of these is a demand or a request, some are fair and some are not, and none is a boundary, because the person whose behavior is supposed to change is not the person speaking.
Why the distinction matters
When you set a boundary in the clinical sense, you keep your own agency: you decide what you will do, the other person can adjust or not adjust their behavior in response, and the relationship has a real chance of settling into a sustainable form.
When you frame a demand as a boundary, you are trying to control another adult's behavior. The demand may be reasonable or unreasonable, but either way, calling it a boundary muddles the conversation, because it implies a unilateral right you do not actually have. The other person hears the framing, gets defensive, and the actual conversation underneath ("I would prefer if you did X differently") never happens.
Worse, the boundary-as-demand framing trains people to escalate. If a "boundary" is really a demand and the demand is not met, the next move is usually punishment: distance, freeze-outs, the gradual end of the relationship, none of which is what boundaries are supposed to accomplish.
The 6 distinctions between a boundary and selfishness
This is the framework I walk clients through, mostly in couples therapy when one partner has been on the receiving end of "boundaries" that didn't feel like boundaries. The handout version is at the bottom of this post; here's the longer treatment.
Subject of control. A boundary controls me ("I won't discuss this; I will end the call if it comes up"), while selfishness controls you ("you have to do X"). The content is the same, but the agency is very different.
Intent. A boundary is about safety, clarity, or sustainability. Selfishness is about getting an advantage or eliminating a discomfort at someone else's expense.
Responsibility. A boundary keeps your share of the relationship, and you offer alternatives where you can. Selfishness drops your share so someone else picks it up.
Proportionality. A boundary is specific, time-bound, and the lightest effective step ("I won't take advice on this"). Selfishness tends to be global and rigid, with a punitive edge ("you are never allowed to speak about my life").
Communication. A boundary is clear, calm, and option-oriented, without JADE (justify, argue, defend, explain). Selfishness tends to be manipulative or retaliatory, often through guilt-tripping.
Consequences. A boundary has predictable, neutral consequences. "If it comes up again, we will wrap up for today." Selfishness frames the consequences as punishment in disguise. "If you do this, I will make sure you regret it."
The 5-C litmus test
A simpler check that has worked well with the clients I see: when you are about to set a boundary, run it past five questions.
Clear. Is what you will or will not do specific enough that the other person knows when they have hit it?
Choice-based. Does the boundary describe your choices about your own actions, not theirs?
Consistent. Will you actually hold it the next time it comes up, and the time after that?
Compassionate. Does the boundary leave room for the other person to be a full human, including making mistakes? Or is it designed to humiliate?
Contribution-aware. Are you still doing your fair share of the relationship? A boundary is not a license to opt out of everything that is hard.
If a proposed boundary passes all five, it is usually a real boundary that is going to function as one. If it fails on one, that is the part to revise before saying it out loud.
Examples across seven relationship contexts
The same boundary framework applies across very different relationships. Here are paired examples of how a boundary and selfishness look in seven common contexts, including parenting young children (where Dr. Becky Kennedy's work at Good Inside is the closest thing to a clinical standard).
Partner
- Boundary: "I cannot keep having this same conversation late at night when I am exhausted. Let's pick a time tomorrow when we are both fresh."
- Selfishness: "You are not allowed to bring this up unless I want to talk."
Parent or family of origin
- Boundary: "I love you, and I am not going to discuss my weight at family dinners. If it comes up, I will step out for a bit."
- Selfishness: "You can't have an opinion about anything in my life."
Parent with kids
The cleanest framework for boundaries with children comes from Dr. Becky Kennedy, clinical psychologist and founder of Good Inside, author of Good Inside: A Guide to Becoming the Parent You Want to Be (Harper Wave, 2022). Her core point is that a boundary with a child is something the parent enforces through their own action, and the child's compliance is not required for the boundary to function. Pairing the limit with validation is what she calls "two things are true," you hold the limit and you hold the relationship at the same time.
-
Boundary: "I won't let you hit me." (Parent physically blocks the hit, holds the child's hand, or steps back.)
-
Selfishness or control move: "Don't hit me," repeated without action when it continues. (The parent is asking the child to self-regulate something the child cannot yet do on their own.)
-
Boundary: "It is time to leave the playground. I will carry you to the car if you cannot walk yourself." (Parent holds the limit and follows through with their own action.)
-
Selfishness or control move: "Why won't you listen?" (Demands a behavior the parent is not enforcing.)
-
Boundary: "I am not going to keep arguing about screen time. The iPad is going on the shelf now." (Parent action.)
-
Selfishness or control move: "Stop being so difficult about screen time." (Rule about the child's emotional response, which is not the parent's to set.)
-
Boundary, with validation (Dr. Becky's "two things are true"): "I know you are disappointed about the phone, and I am not giving it back tonight." (Limit and relationship, held together.)
-
Selfishness or control move: "You shouldn't be upset about the phone." (Trying to legislate the child's feelings.)
In-laws or extended family
- Boundary: "We are not taking advice on parenting decisions. If it comes up, we will change the subject. Dinner Sunday still sounds great."
- Selfishness: "Agree with our parenting or we are cutting you off."
Friend
- Boundary: "I cannot be the only person you process this with. Once you have talked to someone else too, I will be glad to circle back."
- Selfishness: "Stop having problems."
Work or boss
- Boundary: "I will not be available after 7pm or on weekends. For genuinely urgent items, here is what counts as urgent and how to reach me."
- Selfishness: "Stop assigning me work I do not want to do."
Adult child
- Boundary: "We love hosting you. We need a heads-up by Thursday so we can plan."
- Selfishness: "You can only visit if you do exactly what we want."
Notice the pattern across all seven. The boundary version always describes what the speaker will do or not do, leaves the other person their agency, and pairs the limit with a bridge back ("dinner Sunday still sounds great," "I will be glad to circle back," "I know you are disappointed"). The selfishness version controls the other person, leaves no path back to the relationship, and frames the limit as a threat.
When a boundary lands wrong
Even a well-constructed boundary sometimes lands hard, especially if you have not set boundaries with this person before. The early ones tend to feel disproportionate to the receiver, because the change itself is what's new.
A few things that help when the response is bigger than the boundary:
- Stay regulated. Do not match their escalation. The boundary is set; you do not have to defend it past one or two clarifying sentences.
- Use the broken-record technique, briefly. Repeat the same sentence up to three times, calmly. "I am not going to discuss this." "We are not taking advice on this." If it keeps going past three repetitions, follow through with the consequence ("we will end the call now") rather than escalating further.
- Do not JADE. Justify, argue, defend, explain. Each one of those moves takes you out of the boundary frame and back into the negotiation.
- Expect an extinction burst. When a pattern that has worked for years suddenly stops working, the other person often escalates before they adjust. This is normal, and the boundary isn't failing because it provoked a reaction; it's doing exactly what it is supposed to do.
- Bridge back. Pair the limit with a path to reconnection. "We are not taking advice on this. We would still love dinner Sunday."
The printable handout
We made a printable client handout that summarizes this framework: the 6 distinctions, the 5-C litmus test, scripts across the same six relationship contexts, and a few micro-scripts you can borrow when the boundary is hard to find words for. It is free to download.
Download: Boundaries vs. Selfishness (PDF, 2 pages)
If you want to address the underlying patterns that keep boundary-setting hard (often early-life wiring around guilt, conflict-avoidance, or fawning), that tends to happen well in individual therapy. For couples whose conflict pattern includes one partner using "boundaries" as a control move, couples therapy is the right room. We offer a free 15-minute consult with our intake coordinator if you want to talk through what would actually help.
Tagged
Last clinically reviewed: by Christina Mathieson, LMFT #115093.
