Know this: your father is out here, rooting for you with everything I've got. And if you need me, I will do almost anything to support you.
I don't have to get it right, here, or anywhere. Somedays I'm angry about the divorce. Other days, I see how my ex-wife released me from her sphere of influence, and for this I am grateful.
Love your kids with everything you've got. Let go of your ex, as best you can, and focus on the impact your love is having on your kids. Stay true to that value and you will always choose the high road.
I hope she's happy. It doesn't seem like that's the case, but what do I know? I only know that she's shirking on her responsibility to be an available parent to my daughter. That's okay, I guess. That's where I step in as an available parent.