
I’m gonna be honest after the cops had to be called I would’ve been banned him from the apartment. Absolutely go over and tell them to stop if you feel it’s safe to do so. If they wanna fight they can go somewhere else it’s your place too and you don’t deserve to be in the middle of that.
I recommend going to your roommate next time she’s alone/the bf isn’t in the apartment and tell her directly that she can’t keep having fights like that in the apartment. Stress that this isn’t you demanding they break up (which it sounds like they need to do anyways but it has to be her decision if she does) but that all the fighting makes you feel very unsafe and uncomfortable, especially since the cops have been involved before.