You know, there is nothing wrong with hoping he gets well and sober, and still deciding you don't need to put yourself through any more pain. It seems like you want a guarantee that he is NOT going to recover before you give up on the relationship.
I really suggest you get yourself to some Al-Anon meetings to clear up your head a bit. I still care about my alcoholic ex-husband, but if he were to show up on my doorstep tomorrow, with a year's sobriety and a shining future in front of him, I would be very happy for him, and wish him the best. No way would I take him back. It would not be good for either one of us at this point.