Should I even bother trying to make my former friend into my friend again?

So I go to a course full of guys, and I used to be friends with one of the guys. But since he started hanging out with some guys that try to bully me, he now acts like one of them. Saying things to try to hurt my feelings. I honestly don’t care what they say about me, but I feel like they gang up on me because of that. Sometimes I feel like telling them how lame they are (like standing up for myself), but I feel like I’ll make it worse because I can get really deep into people’s feelings sometimes. But I don’t know if I should even try to fix our friendship because he is a major douchebag now?
Should I even bother trying to make my former friend into my friend again?
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