How do you deal with a friend who's great until you need support and then they're gone?

I have this friend… we’ve never actually met in person but we’ve spoken on the phone a lot, we play WoW together.. we just have a lot of fun.

But because I can’t move on from the breakup… well… this is how it went:

Him: Stop being so sensitive
Me: Sorry I’m having a rough night.
Him: Aren’t we all?
Me: Most probably not quite the same.
Him: That’s because most people move on.
Me: Well I’m not ready yet.
Him: Then you can stop looking for pity from me because you’re never going to get it.

I want to cut him off completely but I like him a lot when he’s not being a complete ass. I know most people would say that I should ditch him because real friends don’t act like that… but just really try to think of a time in your life where you couldn’t let go of a friend even though they were a pretty crappy friend. It’s easier said than done.