It sounds like you’re already flogging a dead horse with him, though. He’s not responding to your efforts to fix things in a way that would encourage confidence they could get better. I know it’s tough and you don’t feel ready to let go, but it sounds like he’s ready for it to end. For whatever reason though, he’s not being direct about that. My guess is he’s either enjoying playing this cruel game with you, or doesn’t want to be the “bad guy” by leaving you. In any case, he’s not showing your feelings much consideration.