WH, Yes, your h likes to push your buttons. So, here's what I'm going to suggest and you are not going to like it. In the future, when your D is having a meltdown w/her father...let him deal with it. If he calls you, you do not go there to rescue him. What is he going to do when you are divorced? Call you every time the child challenges him? I don't think so. He needs to learn what it is to be a father and communicate w/his kids.
Stop rescuing him...allow him to wallow in his own stew pot. He wants his days to be w/his kids...then give them to him 100%.
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.