same situation, except me (the girl) is the one who went off to university 4 hours away.
honestly, when people first told me that long distance relationships don't work, I thought to myself "well it WILL work with him" but truth is.. the distance thing gets even worst after that.. and eventually one of you will come across someone who's really nice, makes you laugh.. and is less than a half hours drive away. part of a relationship, shallow as it may be, is wanting to have someone to hold on to, possess if you will.
then again, just because mine failed, doesn't mean yours will. Good luck and just try to make the most out of your time together when he comes back