Not gonna lie. Even though I didn't read it all, Just skimmed through it. I have to say. This looks dumb!!!
┑( ̄Д  ̄)┍ HOW does he expect her to win over the Prince!? He HAS to see how much the Prince HATES her! And he should know that just her being beautiful won't be enough to make him stop hating her. He hates her with a passion! Especially after what happened in the last chapter. (That was waaay to dumb of a reason to get THAT mad, btw. I think they were trying too hard with that scene.)
Oh! Here's A thought...
(⊙…⊙ )Maybe her husband is a weird type of sadist, and it was a lie from the start that he'd divorce her if she succeeded in seducing that Prince. He just gets off from putting her down, and manipulating her actions like that, being on a power trip. ╮( ̄▽ ̄)╭
Everyone else already said my first thought, so I don't need to say anything else.(=・ω・=)