I appreciate everyones' advice.
Here is an update...
I initially thought this break-up steamed from some long-term problems we both have... but I don't think that is the case.
He says that no matter how much he wants to be with me, he can't because he isn't sure who the heck he is right now. He's not proud of himself or happy with where his life is heading...
I don't know if that have a lot to do with me or not. I'm beyond heartbroken. We've had our ups and downs but I know that I want him... there is no question in my mind. He says he knows he wants me but can't bring himself to do it right now.
I really don't know what to do now. I'm trying to be supportive of him finding happiness in his life... it just breaks my heart that I am not his happiness anymore. I'm trying to remain a good person about this and support him in finding the things that makes him happy-- it's just so hard when those things seem to be rooted in hurtful circumstances (parties, drinking with other people, allowing girls to hang all over him)... I hope he realizes that those are the things that are distractions and won't really make him happy or proud...
But it's hard to be there for him AND try to protect my heart. He holds so much of it in his hands and his actions affect me deeply. They hurt. Sorry I'm rambling... I just don't know what else to do anymore. I've broken down more than anyone can count, I can't eat, I can't go to class, I can't even be a cheerful person around my friends.

Thanks for listening.