He's in his 30's, drinks A LOT, and blatantly ignores you... then on top of that he wants to move in with you. Somehow I do not see husband, kids, two-car garage, white picket fence, and the 'perfect domestic life' being built off a foundation as flimsy as this.
You can't change men... so don't even get your hopes up. There's no magic speech that will 'open his eyes' to how much of a grand prize you are and how much it'll hurt him when you're gone.
Take this as a lesson learned (apparently twice according to your words)... You need to really sit down and think about what you would want out of life, and then imagine what attributes a man would need in order to help you achieve that. Then you might have a better idea of what kind of guy you should be looking for.
Cut him loose and move on. You already know this in your heart... so why bother staying?
"The weakest soul, knowing its own weakness, and believing this truth that strength can only be developed by effort and practice, will, thus believing, at once begin to exert itself, and, adding effort to effort, patience to patience, and strength to strength, will never cease to develop, and will at last grow divinely strong."
- James Allen