Good God Almighty Sunny ! What a list of responses.
Here's my 2cents. Forget the guy. Most guys don't want to be friends with their ex's. Obviously he can't handle it. That's his problem and you should forget him.
You can't MAKE him be friends with you.
Ignore him at the clubs. When you see him eye to eye just say "hi" like it's no big deal. Eventually he'll stop his stupid shit. He's TRYING to piss you off.
And this thing about someone accusing you of being a slut. Even if you liked to have lots of sex with lots of different men (or even women), that's bad ? You're a big girl you do what you want. If you want to be cellebate (sp?), who cares ? It's cool either way so long as no one gets hurt.