I hope each break up has made you see, nothing changes if nothing changes.
Get out and stay out, or at least set some goals for yourself once you are out like: you will not have any communication with him until he's been sober for a good while.
You will not fall for his manipulations any more and the only thing you will believe is seeing his recovery, feeling his recover other wise HE'S lost someone good.
Tell yourself each and everyday after you leave that you deserve so much more and will no longer settle for less.
I know it's not easy cause I've been there but it's doable very doable!!!!!