I know this is going to make him super-mad and is this a db slide?
Who cares? What a jerk. If you started out with a nice request and he refused, I would have done what NikB said, taken care of it myself and not another word to H. So you'll do it next time. He is still a royal jerk.
I'm still in awe of the lock on the thermostat.!!??
Have you looked into any type of therapy for your daughter? She is obviously going through something if she is constantly asking about him. She is probably feeling very insecure. What are your answers when she asks?
Yes, detach. And time. You can't hurry this process. There is a cycle of sadness, anger, peace, detachment. I go through it daily, hourly even. The trick is to not get caught in one phase, keep it flowing.