I have no doubt that when it comes to fighting for custody, he will do that bc in the end ALL that the matters to him is that he is viewed as a great guy.
The "father" of my youngest daughter was exactly like this. He was no father in the true sense of the word, but because I dared to divorce him, he went out of his way to punish me, having no consideration whatever how that would affect our daughter. He sounds very much like your husband.
All I can tell you is that in the end, when our daughter was of legal age, she changed her last name from his to my maiden name, which I went back to after our divorce. She wants nothing to do with him. Kids realize more than we give them credit for sometimes. Just keep doing the next right thing and your daughters, when they are old enough, will realize the truth. That doesn't mean you won't suffer now...I did, but in the end, it was all justified.