I sincerely hope for your sake that he stays on the road to recovery. However, it doesn't have to be as black and white as you described. He may well binge again, and you may well leave...that doesn't preclude that somewhere down the road, he will find a long-lasting recovery and you won't be able to get back together. Alternately, you could decide to leave and find that in the end, you're quite happy in your new life, without him. Anything is possible.