I Want You Back — Thayer King

Seven years ago Ashley White made the difficult decision to give up the love of her life. She's never forgotten him. She's returned and she's willing to do anything to win back the man she's never stopped loving.
Stephen Ashcroft has never recovered from Ashley's betrayal. She has the audacity to ask for his forgiveness. He'll never trust her again, but for the sake of revenge, he's willing to pretend that he can.