Still Me - Jojo Moyes, Penguin Books

Lou Clark knows too many things . . . She knows how many miles lie between her new home in New York and her new boyfriend Sam in London. She knows her employer is a good man and she knows his wife is keeping a secret from him. What Lou doesn't know is she's about to meet someone who's going to turn her whole life upside down. Because Josh will remind her so much of a man she used to know that it'll hurt. Lou won't know what to do next, but she knows that whatever she chooses is going to change everything.