He unexpectedly dumped you, am assuming he provided no explanation, and had another chick on his arm like two nano-seconds later - why would you even want to maintain a relationship with him, friendship or otherwise?
I can understand it hurts but don't give him the satisfaction of knowing this, have some pride and front like he doesn't mean a thing, like he doesn't even exist, you are probably lucky that he displayed his true colours so early on, think good riddance. You are still young, you will meet plenty of guys, some whose heart you will break, some whom will break yours, it is all part of the dating game, brace yourself. And be stingy with the sex!
[SIGPIC][/SIGPIC]
Love is like a merry-go-round: you get all dizzy, and then you feel sick!