If he's threatening you, you could probably say something to campus security or the police. I was friends with a girl who had a drug addicted, abusive boyfriend. I tried to convince her to leave him, tried to be the guy she could trust. hings were fairly intimate with us...nothing too far, but most people thought we were dating. It took him throwing her through a glass table before she finally left him. And guess what, she found another abusive drug addict to date and then eventually marry. And divorce. Shortly after the second guy, I cut her out, and I haven't missed her since. I found myself a girl who actually cared as much as the other one said she did, and the difference was night and day. Instead of constantly pining over some chick that you don't have a chance with, trying to figure ways to be with her, "Oh, if she could only see!" crap, I'm happily married to a woman who truly does think the world of me and I never look back.
Moral of the story? Quit chasing the stupid chick that likes getting beat up, find yourself a good woman, date her, and be happy. The one you're "in love" with now will only move to another craphead of a boyfriend and you'll be crushed thinking you finally got her away from this other guy.