As tough as things get, just remember YOUR job as a father will never change. Hug those kids.
Useless advice: - Even though she said you could, don't pin it all on her. Just don't get into it. They're kids. Don't dump any more of adult probs into their world. One of my friends talked about how his dad discussed all his divorce problems with him as a teen. He wishes he never heard any of it. It was just too much weight.
- Counseling sessions for the kids are a good idea. They need a place to talk it out.
"My actions are my only true belongings. I cannot escape the consequences of my actions. My actions are the ground upon which I stand." Thich Nhat Hanh