The story
He married her sight unseen and made her the joke.
Declan is the Harrison heir, married off to Claire, a tycoon's daughter he meets for the first time at their own wedding. She is nearly three hundred pounds, and the guests turn him into the laughingstock of the day. He never forgives her for it. Claire loves him hard anyway, and every time she tries to protect what they have he punishes her for it, down to her weight. So she stops trying to be loved by him and starts a transformation aimed squarely at making him regret every word.
