After re-reading your initial post, I have one more thing I need to weigh in on. Perhaps someone else has already touched on this - did you notice how he said "I'm sorry YOU don't understand addiction and YOU're leaving me." See how crafty he was to put the blame on you when its HIS addiction thats the problem?? With that statement, he has accepted no responsibility whatsoever.
There - more to fuel your anger and keep it at the forefront for a while longer...