You already said goodbye to him. Was he the one who called you? Who called the deputies?
You don't have to step back into this relationship. He can get well without your presence. If I heard that my second husband was back in the hospital (he almost died there once), and that he had "hit bottom" (yet again), I would pray for him but that would be it.
Your help isn't needed here.
My suggestion is that you go back to your task of building a peaceful life for YOU.