Detaching isn't meant to punish him, it's just to keep you from an unhealthy involvement with his drinking behavior. He is responsible for his own relapse, just as you are responsible for your own sobriety. Your drinking may have given him an excuse, but it isn't the reason.
Al-Anon can be a great help. If you haven't been, I think it would work very well with your AA recovery.
I hope you will protect your own sobriety at all costs. I don't know what "loud and belligerent mean," but if you are talking about abuse, you need some help dealing with that.
Hugs,