I can understand your frustration - your H is not only a WAH, but appears to be somewhat a WAF (walk away father). From what you have written, he does not show the desire to be with his own kids 7 days a week. Heather, it hurts so much to see the most important thing you have ever had in your entire life - your family - be disrupted the way it is. I just hope you know that DBing has a primary purpose - to improve ones self and happiness for themselves so as to possibly pull back the WAS, and a secondary purpose which is that if the WAS never comes back, you (and your kids) will be able to move on much easier if your M is to end. Just remember - keep trying to detach, make yourself happy, focus on your kids, and with persistence and patience, your H may eventually discover a great family that he has been forsaking.
I have confidence that you can be a catalyst in turning your M around. You have one huge obstacle to not have to deal with - your H has not entered into an A. Be thankful for that.