Shades, I don't find your title stupid at all. It states exactly what you and others are attempting to do here--find their way amongst the fall out of a spouses walking away.
I'm very sorry that he's behaving the way he is w/the children. Children are such precious gifts from God and the damage he's creating, i.e., lack of communciation and/or interest in them, will come back to haunt him in life at some point. You, on the other hand, have been there for them and they know it. I wish that he would see the light of day and realize that once the damage is done, it's very difficult to correct the situation. But, as we all know, we can't control them and their actions. All we can do is be there for the children.
Shades, you are a wonderful lady. So what if the ow is nice looking and has a lot of cash. Looks will fade, cash will be gone and what does she have left when it's all said and done? Nothing. You are the one that has all of the wealth--children, family and friends that will do anything for you. So, please do not compare yourself w/this woman, for she's the one that's involved w/your h and should have more respect and dignity for herself than she does.
Hold your head up high, back straight and know that you are the one w/such grace, dignity and respect for yourself and no one can take that away from you.
Sit quietly, the answers will reveal themselves when you least expect them to. The past is gone, the present is a gift and you need to focus on today, allow the future to reveal itself when it is ready.