Sally... A man who is healthy finds a way to make his W feel like she is #1, esp if the W is not withholding. Obviously he doesn't feel so great about himself...what he can't see is that he is taking his family down with him. The question is, how much does he have to lose in order to wake up and turn things around?
I know it's hard, but try not to personalize his actions. Protect yourself as best you can and make your life as fulfilling as possible without him. How sad that the kids are distancing themselves from him as well.
I do believe that changes can occur, even in the eleventh hr, and hope to hear a happy ending here. Just curious--you mentioned that everyone in his family is divorced; what thoughts does he have about it all? Sometimes people try like crazy not to repeat those same mistakes. Has he given any thought to counseling? is he religious/spiritual at all...any guidance there?