I'm going to stop all communication with my ex-best friend
What did he do to cause you to make this decision?
He's driving me crazy like a ticking time bomb. I'm afraid he might explode on me one day
Well, he's your ex-best friend for a reason. If you can spot this before it becomes a problem, that's a good thing.
My life is so much better without him....
If you feel that you have a better life since you stopped talking with your best friend than you probably made the right choice. Sometimes you have to really just put yourself before others if you want to be happy. Besides, you can only truly help other people if you, yourself is good.