Spot on Kalahou!!
It's a tough reality for our Difficult Child when the gravy train runs out. I think it's even more so with the young generation as many of them already have an "entitled attitude" regardless of whether the family has money or not.
Many here have had the same thing happen to them but in time they always reach out, usually wanting something. My son has never contacted me to just say "hi mom how are things", it's always about him. He learned a long time ago to not ask me for money but that doesn't stop him from playing the pity party game.
You sound very strong and have a good grip on what's going on and what needs to be done. None of this is easy but you are here with us and we are here to support each other.