It really sucks about him not seeing the kids. I can't relate much to that. It happens here. Have you read any of the mlc resources to kind of give you an idea what may be happening with him?
I know you have said that you have had trouble with him telling lies for a while now but he has never been this way as far as the kids go right?
You should do some reading to give you a better understanding about the craziness and how to deal with it.
