My experience is limited. However a woman wishing to dissolve a marriage – which presumably her husband invested time, money and heart in – needs to justify herself. On what grounds does she want out?
If she cannot justify divorcing, then he has every right to deny a get. She is trying to do an injustice, to harm another. No one has an innate right to a get.
However, he needs to be realistic. If its not gonna be, its not gonna be. Just or unjust, if she tunes out, there will be no marriage. Its over. So I think it would be right that he humor her and divorce her, because he anyhow has no hope for a marriage here.
(Perhaps I’m wrong but marriage seems analogous to partnering in a business. Would one partner tolerate the other to just walk out and destroy the business in the process???)