"All just to try to get me to agree he can see the boys in an environment I'm not comfortable with."
THIS is what stands out to me. You are so used to being dragged thru the lies and manipulations he uses to get what he wants that you are trying to figure out if this was his bottom? what is he really doing? Can i trust him? Am I right? Etc etc.
Stop. Take a really deep breath. No, this is not the end of the bad behavior. You are allowing yourself to get sucked back in to his sickness and the drama. Do not allow ANYONE into your home who you do not feel comfortable having in your home. His visitation with his children is his responsibility. That is what divorce is about. That is also what detachment is about. Step away from the alcoholic. Recognize the his visitation and those children are your hook. Refuse to bite.
Hope this helps. Trust your instincts.