The longer I waited, the harder it got, because i started to forget the reasons I wanted to break up with him. I found myself making excuses on why i should give him another chance, and he could see that, and took advantage of my weakness. Like Duped said, they are amazingly good at drawing you into long conversations, eventually convincing you that it's your fault the relationship hasn't worked yet. Then they will promise you they will quit drinking, do it for a couple of days, and then things go right back to the way they were.
Get out while you still can!!! I'm so glad I did!
Good luck, and please keep us posted!