Hey LT. That is a hard spot. And the easiest thing for the mlcer to do is blame you. They are so unaccountable and in their head, everything was going to work out fine. I and for me, xh always expected everyone to just go along with his shenanigans.
Now that my kids can "tolerate" him in small bits, he is jumping right back to his old ways. But, its not really a r with the kids, you know. Taking them to a drive through a couple times a month, or spending a couple of hours together once a month, or texting good night is not being a parent.
I think you are doing the right thing, just staying out of it. I hope your d had someone to talk to or confide in. It is tough stuff for these kiddos.
It is unfortunate that they don't see their actions really affecting their kids. But how could they? It does not go along with their instant needs. And, like a teenager, it is very selfish, unaccountable thinking. It is everyone else, not them.