One True Loves by Taylor Jenkins Reid
Emma met her true love in high school. They move to LA to go to college and then they get married. After 1 year of marriage, Jesse goes on a business trip and never comes back. Emma is torn and lost without Jesse. She moves back home to Acton, Massachusetts. It is there that she finds love again in an old friend, Sam. They fall in love and get engaged. Until one night, Jesse calls her after three years. Her first love is alive.