Hey K, here are my thoughts. And as long as you continue to be his friend and be so available, he has the best of both worlds. He still gets to have his family life and his other life as well.
Dbing is first and foremost for us. Your h is on a journey that he needs to travel through alone.
You need to detach, GAL and try to have a PMA. I think you need to stop contacting h unless it is something urgent about your children. Be upbeat and positive when you are around him. Try not to call,email or text him. He needs to see how life is without you in it so give him a lot of space.
Try not to give him too much headspace. Detach and move forward with your life. Keep busy, find things to do that you like. It really doesnt matter if he is with ow now or not, ya know?