My Ex could have written this, word for word. I was exactly like her husband, too. Obviously this woman is a lunatic, but both people are at fault here. Men should never have serious relationships with a woman whose sexual history they are uncomfortable with.
I'll give the guy the benefit of the doubt, and assume he didn't know any better. I didn't think my Ex's sexual history would bother me until I was into the relationship. Thankfully I ended the relationship when I realized it was just too much for me.
The woman should absolutely end the marriage, no question. I feel really sorry for this guy. He married a woman who won't give him any passion, mocks him behind his back, lies to him and cheats on him, and doesn't have the guts to end the relationship. Pure malevolence.