Wow, you are a very strong person to be able to let go like this. I applaud you.
It's true that if they aren't working some kind of program in earnest, it just gets worse. As one other member puts it, "Let go or get dragged".
Even if you don't give him the reason, he will know it in his heart. No one likes to be in the midst of chaos and turmoil.
I don't know him, but my experience tells me that you might expect a crying and begging episode. Stay strong.