I don't know if MAchine is still looking at this page, but if he is, here goes.
I feel your pain, I had a similar situation. It sucks losing a close friend like that. There isn't much you can do about it, except cut the guy out like a diseased tumor and move on. But before you do that, maybe you should make sure what his motives are. You never know what goes on in other peoples heads. He may have heard something that you "suposedly" did and then reacted. But If he still acts like an ***, drop him like dead weight. I used to go on when people who I thought were my friends did that and let me tell you, it gets you nowhere. All you end up with is a person that will screw you over at every turn. If he doesnt realize what he has lost with the end of your friendship, and doesnt want it back, then you are better off not being his friend. He may have been friends with you in the past, but people change over time, or your perception of them change.
Furthermore, with the girl, I think its your right to tell her, especially if you are friends with her as well. The guy sounds like scum, and if you like her then there is something about her that makes her a good person (unless you like a bad girl). If that is the case then he doesn't deserve to be with her either.
hope that helps