I'm going to call my best friend a dick for ditching me at a party
Would you consider forgiving him instead?
I don't know, he really hurt my feelings.
Harsh words can do more damage to your friendship rather than heal it. If you can find it in yourself to forgive your friend, this is a positive way to remedy the situation.
But what about my feelings? What should I do to get better?
You can forgive him and he can say he is sorry to you. That way, you both have your perspectives acknowledged and you can move on still being friends.