The Last Tale of the Flower Bride by Roshani Chokshi

Once upon a time, a man who believed in fairy tales married a beautiful, mysterious woman named Indigo Maxwell-Castenada. He was a scholar of myths. She was the heiress to a fortune. They exchanged gifts and stories and believed they would live happily ever after - and in exchange for her love, Indigo extracted a promise: that her bridegroom would never pry into her past.