When do you dump a friend?

I blogged about 2 weeks ago about an ex that really hurt my feelings calling me totally drunk. It's been close to 3 weeks since this incident and I'm still really hurt and upset about it.

When do you call it quits on a friend? When do you decide to never talk to someone again?

This is what I'm pondering tonight. I have so much unresolved anger relating to my relationship to him and when he drinks and becomes an ass, it brings up all this anger to the surface and then it becomes all consuming.