There ain't nothing wrong with you, unfortunitly love can make us blind and alter the way we see the people we love. I'm going to be honest, you deserve better then this man, he should be begging for you to stay, not the other way around. It is a blessing, you've done what you could for the guy, and obvisiouly he's a mess.

You'll do much better off, plus if your daughter despices him then that should be very important too. It hurts to be alone, but I'm sure you will find somebody better and not an junkie. Just let this one go, for the sake of yourself and daughter.