Get him involved in things out of school where he can meet more kids and it can be more relaxed..school is..school and well it sucks.

Groups, activities, something he's into and can meet other kids. YMCA? Sports in a next town over where he's less likely to know anyone? Kickboxing/Martial Arts class? (might even build more self esteem)Check the Craigslist Activities section..might find something in there.

Therapy isn't going to help it can make it worse like you've already noticed. They try and PUSH kids into putting themselves out there and they are bullied and humiliated again. It's not going to make kids like him. He needs some kind of group or something where he can interact more with other kids. Start over fresh with someone who hasn't heard about his "reputation" or whatever the problem is.