I believe your SO loves you. I believe SO is extremely messed up.
If you go completely dark, he may sink low enough to break. If he breaks he can be rebuilt.
If he's allowed to get enough emotional sustenace to keep hanging he will. He'll continue to glide. and I mean for the rest of his life! If this ow is not good enough, he'll get another one.
Noone reaches bottom willingly. He's like an alcoholic, you have to let him reach rock bottom, it's the only way.
I don't know if you've read Love must be Tough yet or not.