SBJ those are my fears too. I'm terrified that my H is done, and that even if he comes out of his MLC he will not want to try to rebuild our family. And I'm also afraid that because of how strong minded he can be, he will not want to admit to making a mistake.
I really feel for you. But I don't think there is much you can do about those fears. You cannot change her mind, fix her or show her the truth. As you say all you can do is to try and be The Lighthouse...
"There's nothing sadder than a conman conning himself"
“There is freedom waiting for you, On the breezes of the sky, And you ask "What if I fall?" Oh but my darling, What if you fly?”