Future, a really good book for kids is called "Dinosaur Divorce". It's a kind of cartoon, but my kids read it with the school counsellor and both thought it was helpful. She loaned it to me to re-read with them. This does suck for the kids, and for you. Its so hard and embarassing, too.
I've been reading about John and Elizabeth Edwards. Its so interesting how the one who had the affair will do whatever they need to do to "save" themselves from their guilt. I agree with CityGirl. My H said he wanted to stay with me for months, and, like you, he gave me nothing...everything was about him. In the end, they just want you to make the D decision, I think, so they won't feel so bad. So on some level they can say to themselves that they tried.