Boyfriend over without roommate
So I’m kinda looking for some advice. I have this roommate where she constantly has her boyfriend over all the time. This in of itself isn’t a problem because everyone has a right to have guests over however she lets him stay at the apartment while she goes to work. Mind you this apartment is only girls leasing it and this boyfriend just got out of jail and I feel incredibly uncomfortable about having him in the apartment without her there to “watch” him. This roommate can get pretty aggressive when confronted and doesn’t clean up after herself or her boyfriend. I am the main lease holder with my father being the guarantor the there is the bad roommate and another roommate that just moved in that is also quite uncomfortable with the boyfriend being in the apartment without anyone with him. What should/ can do? I have wanted to talk to her or the boyfriend as he is a bit more chill than she is but idk. I have also played around with the idea of just calling the cops to make him leave…
Update:
I did talk to the leasing office. The only thing they can do is evict us. The boyfriend is violating a term in the lease agreement that gives the leasing office, this is an apartment complex not just one person landlord situation, grounds for eviction and that’s the only thing they will do or are willing to do. It makes complete sense. I did take the advice to go talk to the leasing office and that is what they told me. I understand everyone is saying talk to her, that’s the problem whenever I talk to her it always ends up in an argument as I can be a little blunt and honest, I don’t know how to structure the conversation so an argument won’t pursue. Please stop telling me I haven’t taken the advice bc I have and you are just being rude.