Sorry you find yourself in this situation we all know so well. I have been away from the boards for some time doing a flyby. I skimmed your posts.
If I have any advise for you, it is to become the best dad you can. Do not let anyone, or anything stand in your way of that.
"What is best for your kids is best for you."
Let this statement guide you though this difficult period of your life.
Your children need you involved in their lives just as much as they need their mother. Get 50/50 parenting in place.
Focus on being DAD right now. Take care of you and your amazing children. You will not regret it.
As far as WAW, you have no control of her. You do have control of how you interact and respond. Change the way you interact and that forces a change in the relationship.
This is a great time to learn how to be an attractive man. Confidence, respect, humor....this list goes on and on.
"What is best for my kids is best for me" Amor Fati Link to quotes: https://www.divorcebusting.com/forums/ubbthreads.php?ubb=showflat&Number=2879712