I just got flashbacks of my last relationship from both sides of the 'coin'. It's truly madness and he essentially 'flipped the script' of YOUR breaking up with him back to you when you called out his drinking. So, now you feel like you got 'dumped'..yeah..he's smart and manipulative. I and most here would know,because..most,if not all, were/are/can be masters of manipulation. You really did dodge a bullet. If your feelings of 'what if' persist, I'd recommend going to a few Al-anon meetings or a few therapy sessions. That way you can confirm that you made the only logical decision in your best interests. Breakups suck/hurt with or without booze or drugs involved anyways.