How many years away from him are you? IT takes several years not to be soooo angry. I am 6 (wow) 6 years out and I am not angry, although there are triggers that might set me off for a moment. However, they are few and far between.
The more new life experiences you have, the more new people you meet, the more you develop a life outside and a part from your ex, the less anger you will feel. It just takes a long time, years long.
Hugs