I set a boundary with someone, that they wouldn't hang up on me in anger when we had a fight, because its their go-to tactic for making me suffer for a few days and i experience it physically, and its something they do in every fight, they antagonize me and throw anything and everything back at me, and try to get me frustrated so i push it further and they angrily denounce me and forcefully hang up. I seriously worry its going to cause me to have a stroke. I told them that I wouldn't be their friend anymore if it kept happening, and that I was setting that rule for myself. They just did it again after a few months. I hate the position they're putting me in, I hate how they need to break any boundary I have, any promise they make me, just to make a point about how little I really matter to them, how much power they have over me.