yes... go forward, not back. Drink doesn't really have anything to do with it: you're just torn between an old man and a new one. The usual answer, and the one that seems to work best, is to remind yourself that the old relationship ended for a reason, and the new one still has much to offer. (And in case you're secretly wondering... no, you don't owe it to him to go back to him just because he's dried out. He's dried out for his own reasons, and it'll turn around his life if he can stick with it. But that's his life, not yours now.)