It's easier to blame you than to admit he has / is the problem.
That's very "logical" to an alcoholic--nothing strange at all.
I agree with others--get the legal wheels in motion, and have contact only
by text about the kids.
Document everything he says and realize you have made the best choice for your children.
I grew up with a drunk, and believe me, it is so harmful many people never get over it.
Have faith you acted in the best interest of your children and look forward, not back