Decide what the boundary concerns
A boundary can be a practical statement about your time, space, availability, or participation. It does not require a diagnosis of either person. Before starting a conversation, ask what you actually want to protect and what action is within your control.
This guide gives editorial examples, not a validated relationship protocol. A clear sentence can help explain your position, but it cannot make another person agree or respond respectfully. You can adapt the wording, delay the conversation, or choose a different form of support.
Use a specific situation
Instead of “You always demand too much,” describe the situation and your availability: “I cannot take calls during work. I can speak after six.” That gives the other person useful information without asking them to accept a general judgement about their character.
You can be brief. If you want to explain, choose an explanation that is true and relevant rather than building a case that you hope will make your needs permissible. Your availability may differ from theirs. The conversation can include that difference without making either person the villain.
Separate your request from your next action
A request describes what you would like: “Please ask before sharing a story about me.” Your next action describes what you will do if the situation continues: “If private information is shared again, I will stop discussing that topic with you.” Choose only actions you can realistically carry out.
This is different from trying to control another person with a threat. You do not need to invent a consequence for every request. Sometimes the next step is simply to repeat your position or decide whether an arrangement works for you.
Leave room for a response
Example: “I can help for an hour on Saturday, but I cannot stay for the whole day.” If the reply is “That is not enough,” you could say, “I understand you need more help. An hour is what I can offer.” You can acknowledge disappointment without changing your answer automatically.
Later, check whether your words and actions matched. Was the boundary specific enough? Did you offer something you did not want to offer? You can revise an agreement when circumstances change. Repeating a boundary is not proof that you explained it badly, and difficulty setting one is not a personality diagnosis.
Source and scope
NHS relationship guidance: NHS discusses boundaries and open communication. Our conversation examples are editorial suggestions; the source does not validate a particular script.
If there are threats, violence, or fear for your safety, do not try to resolve the situation by negotiating alone. Seek appropriate local support.