My Roomate

Me and my friend just moved in together and she jsut started seeing this guy. Well I work with him and he lives in a hotel and he has already broke into someone’s car. I live in a small town so everybody knows everybody. And well she started talking to him and she’s been happy. But every night he gets mad at her for some little thing. He says mean things to her and she comes home crying. This has happened five nights in a row. Last night she came over for the first time and it look like it was going great and I leave for like 20 minutes and when I get back he’s gone and she’s crying. Not to mention all these nights she leaves in the middle of the night after the fight and she goes knocks on his hotel room and then they’re good again. I told her this is not how relationship works but she still keeps going back to him and I don’t know what to say or to do. Not to mention I’m 17 and she’s 19. And this guy is 24.