Your story is similar to mine, my exah never did get sober (though he did a lot of what yours is doing now).
He will never "get" that you have a right to leave him so don't wait around for that to happen. I have been divorced for nearly 3 years and he still does not "get it".
He is going to say all kinds of terrible things to the kids, he does not want to lose his enabler.
It's ok to leave.