People sometimes fear that setting a limit will make them seem uncaring. In practice, clear boundaries can make relationships more honest by helping each person understand what is and is not okay.
A boundary is about your participation
You can say what you are comfortable with and what you will do if a situation continues. A boundary is not a way to control another person's choices. For example: “I cannot talk while we are shouting. I will take a break and come back when we are calmer.”
Limits can change
A person may be comfortable with something one day and not another. Consent and boundaries are ongoing conversations, particularly around physical intimacy. No one owes access because of a past yes or a relationship label.
Notice the response
People can be disappointed by a limit and still respect it. Repeated pressure, punishment or intimidation is concerning. If you feel unsafe setting a boundary, speak with someone you trust or seek specialist support.