Once Upon a Broken Heart by Stephanie Garber
Quote: "It wasn't that long ago that I saw you in my church, willing to promise me almost anything to make the pain stop. Was that a lie? Or have you already forgotten the way heartbreak rips apart the soul piece by piece, how it turns you into a masochist, making you long for the thing that just eviscerated you until there's nothing left of you to be destroyed?"
Blurb: For as long as she can remember, Evangaline Fox has believed in happily ever after. Until she learns that the love of her life is about to marry another, and her dreams are shattered.
Desperate to stop the wedding, and heal wounded heart, Evangeline strikes a deal with the charismatic, but wicked, Prince of Hearts. In exchange for his help, he asks for three kisses, to be given at the time and place of his choosing.
But after Evangeline's first promised kiss, she learns that bargaining with an immortal is a dangerous game - and that the Prince of Hearts wants far more from her than she pledged. He has plans for Evangeline, plans that will either end in the greatest happily ever after, or the most exquisite tragedy.