How you treat yourself and what you accept can communicate your boundaries. Other people's behavior is still their responsibility.
I believe we need to take our own needs seriously if we want to communicate them clearly. That may mean saying no, naming an expectation, or noticing a pattern we have been tolerating. But setting a boundary does not guarantee that another person will respect it. Their behavior belongs to them. Your next choice may involve support, distance, or a different arrangement. Self-respect and accountability can exist without taking responsibility for someone else's mistreatment.
Wisdom Window
What boundary needs clearer words or more consistent follow-through?