From reading your post I get this:
* The drinking was already there when you started but you didn't notice right away and when you did, you suppressed your feelings about it
* The drinking continued and your problem with it caused some major disagreements
* The drinking has slowly escalated with some alarming events as proof
* Your relationship is currently stuck in a cycle of anger, resentment and denial/minimizing (him not you)
* You now want out
Perhaps the question is..."how do I leave"?
Correct me if I'm wrong...