Sandy84:
Nope i don't care about him, he's a a jerk, alcoholic guy who beats her up and steals her money..
Sounds to me like she's made her choice: she'd rather be with an awful boyfriend than a (presumably) good girlfriend.
If she won't leave a loser like that for you, then mark my words, even if she does leave him, she'll dump you the moment a decent guy appears on the scene.
The only possible reason to stay (temporarily) is if she's planning on disappearing from his life in an untraceable way (sometimes necessary in cases of domestic violence and it does take preparation). But there's no indication from you that that's happening.