I'm looking for a romance similar to My Rich Wife, the idea of the plot is the same, with the good protagonist being treated badly by the girlfriend who cheated on him and her family. He was a personal trainer and somehow, he ended up making a deal as a wealthy CEO to pretend to be her husband, but she ends up taking an interest in him and refuses to accept the money he borrowed back. That's all I remember. Could someone help me find the title of this novel?