Sadie,
Welcome to the Board.
He was working his program, until he wasn't.
That's always the case, isn't it? One minute, all seems well, and then the next, he's gone off the rails. As for what you should do, that's simple: do whatever is necessary to protect your children. However you choose to do that is entirely up to you. All I would add is you should assume the worst, meaning your AH is going to continue to use. His words, at this moment, mean nothing. Until he decides he's had enough and starts doing the necessary and hard work to recover, you should do everything within your power to protect your children, and yourself.
Be safe.