Just keep the moral high ground hun....it works wonders! Learn by my mistakes. I sunk to my ex's level too many times, still do some 11 years later [:0(] It gets you no where. If he wants to see his daughter, smile and say of course, if he shouts at you...walk away!
I'm so sorry you're going through this, I know how damn hard and soul destroying it is BUT you will, as in the words of the song, survive.
Keep smiling.
Lisa xxx