I am so sorry that she is going through this! What a very difficult situation and my heart goes out to her. Though I am not in her shoes, as none of us are, my advice comes from my faith and spiritual background. We are given only one instance
in which divorce would be a choice, so I would suggest a lot of prayer, communication and seeking godly counsel. Maybe there needs to be some time for the two of them to work things out (and it sounds as if he may need counseling outside of the
marital issues in regard to his fear of being alone) rather than a move toward divorce. I'm not saying that's what she's going to do or is planning and she may even be of a different belief. I can only share from my perspective and maybe it will be
something for her to consider as one of her options. I will certainly be praying for her and again, I am so sorry to hear this sad news.