Interesting how they all use the same script - and imply that in some way it is our fault. I agree it all comes from guilt. Know what you mean about it not feeling 'right' Not sure it ever does. It is so hard to accept that the lovely human being we married and lived with is just not there any more.
We know the passage of time, and the rigorous practise of detachment brings us to a place where their actions do not affect us. Sure we see our kids hurt, and that hurts, but that comes from their toxicity, and there is nothing we can do about it. But like so many of us here, I still miss the presence in my life of that loving person.