My dormmate has a boyfriend who has been taking drugs in our living room. He also has bipolar disorder. Over the last few weeks he's been getting increasingly violent and has been squatting here as her guest. This morning at 4AM they start screaming at each other because my dormmate found him cheating on her so she goes off about all his illicit behavior and that's how we all found out that he's been hiding/ taking drugs in our room all this time. She keeps yelling that he needs to leave and he's not leaving. About an hour goes by and finally I'm like fuck this. I give my roommate my phone and say call UPD if this gets bad and basically walk out there and tell him if you don't leave I'm calling the police I know my rights and I'm doing what I need to do to keep these girls safe. Leave. NOW. He refuses. So my roommate calls the police. The police come and now they kept him in the hallway. So when we leave to go get our RA he starts yelling at me calling me a bitch and that I did this and that he's going to get me. The issue is that he has a gun. And suddenly I'm regretting telling him to leave. Help! What should I do? People get attacked all the time by white mentally ill men. I'm really scared. Please give me advice of what to do next.