Mighty, it isnt right and it suckks big time, but, it's what they do. It just is.
Unfortunately your daughter has to realize she cannot count on her dad. Tough lesson to learn, I know, but that's how this goes, sadly.
The sooner all of you realize that, the better off you will be. He is lost and in crisis. Not an excuse. Just an explanation.
I know it hurts to see your daughter upset. And I know it isnt fair that you have to have all the burden. But you are their touchstone right now, their rock. And truthfully, at least for me, I was honored to be it. It is his loss, M. All the way around.
Please dont allow his actions to adversely affect your life, hard as that might be.