You fell for the wrong guy. People know the history, know you sorta of like him and hope to cause problems. If you go back to him then you add to all of this. Students have nothing better to do then screw with people, and you are on the top ten list. Sexual assault is assault, and by going back to him or having interest says you validate what he did to you. You need to focus on why you let someone assault you repeatedly and why you aren't seeking counseling for this. Why didn't leave this person a long time ago? Maybe you need to look at feeling insecure, is this from childhood? Tell *friends* that talk about him, you have moved on and really don't want to talk about him.
Everyone is saying here this is a unhealthy response you are having. If he never valued you, he never will. Why? Because he doesn't value woman at all, ever. That's the way he was raised. That's the way a lot of men are raised, it's your job should you wish to date, to find men that don't view woman as something to just use sexually.
Some woman chose to stay single, and you have that option too. Take this energy and direct it towards studies and getting employed in the future, start concentrating on you and how you will support Yourself as a young adult. Jobs are tough in this economy, maybe you should direct all your energy there instead. Good luck, time to move on, kick his butt to the side, he has nothing for you but misery, why subject yourself to this?