hi turtlegirl71,
I can relate to everything you said, it is deeply disturbing watching someone with a child self destruct and feeling helpless to do anything about it. I also have added guilt for talking about it (even here in an anonymous forum), as me caring at all seems to trigger my step daughters as I shouldn't care as I'm not their "blood" (their words). I think but don't say "I'm married to your father! of course I care about your kids, his grandkids, I'm not a cold heartless *****." I have empathy, I feel, I'm in this family too.
I found this youtube channel soothing, I hope it helps you to
https://www.youtube.com/watch?v=yvWccOLdxzYPlease share more if you like.

b