This really isn't advice, just me ranting....
It's funny, my Freshmen year I did the "hook up" thing and really didn't think twice about it. I wasn't a slut or easy, I just enjoyed the partying lifestyle. It was like I was using boys and alchohol to cover up all the hurt I had...
Now, I'm older, wiser, and honestly I respect myself.
However, in your situation.....I would try to build a friendship with him, where he respects you as a women. Males have a harder time hurting girls they repect. And don't push the issue. You want things to come naturally, especially if ya'll have already hooked up. So, just be the wonderful, beautiful, but REAL YOU and he'll come around.
And if he doesn't, F**K him
Ivory