You've suffered a tremendous series of disappointments and anger is a natural response to that. I think you're learning, though, that anger can either be a great motivator for change, or it can eat you up inside. You don't want to look back at your life in five, ten, twenty years and feel that you lost all that time focusing on someone who let you down so terribly.
Therapy was the single biggest thing that helped me let go of all the resentments I held on to so tightly having grown up with an alcoholic mother. But there are lots of programs for recovery including Al-Anon and Celebrate Recovery. He may have had the drinking problem, but you have years of living with an active addict to recover from too.