And really, how is acting like a d*ck head to your W going to make YOU feel any better about YOU?
Your daughter needs support and guidance right now. The only way to do that is to improve you. Showing her that it is okay for a man to act like an ass simply because his feelings are hurt and he didn't get his way is a very risky precedent to set for her.
There is plenty of free info on this site about validation and setting healthy boundaries. Ask your IC for resources on co-parenting. Take charge of you.
