Tree:

I'm sorry to hear about your pain. Go with it, acknowledge it to yourself, and to others too. Go at your own pace, but you will emerge better for it. Your healing, and the well being of your kids,are what is critical here.

Your W is going to do her own thing, and you can't control that. You can control your reaction, and the future direction of your life. At times like this it's easy to rail against the universe as unfair, and see ourselves simply as victims. Try to resist that temptation. Instead, create your life one step at a time. There will be setbacks, but try to go forward after you fall down. Abandonment by those we love is one of the hardest things to deal with; you are doing admirably well.