Love The One You're With, by Emily Giffin

Photographer Ellen has been married to Andy for 100 days when she bumps into her ex-boyfriend, Leo, at a crosswalk in New York. She had never understood the reason for the breakup eight years earlier. Leo wants to be friends, and Ellen reluctantly says yes. The past relationship had been very intense. A few weeks later, Leo calls Ellen to offer her a photo shoot with a famous star that he is writing a magazine article for. The job is in L.A. and when she arrives there, she finds that Leo is there waiting. Having never felt closure about their separation, she asks him why he broke up with her. They end up sharing the plane ride home & Ellen feels old emotions start to stir. She doesn't contact him after the flight & a few months later, she & Andy move to Atlanta where he (a lawyer) works with his father & they live close to his family, including his sister, Margot (who happens to be Ellen's best friend since college). Ellen is not too happy living in Atlanta & longs to return to New York even though her husband seems to be happy with the move. When Ellen reads Leo's magazine article that accompanies her photos, she emails him to say she liked the article. He then invites her back to New York, the place she wishes she would've stayed, to take photos at Coney Island. While there, Leo reveals that he still has feelings for Ellen, and although she feels the same & considers leaving Andy & everything else behind, a phone call from her sister, Suzanne, brings her to realize that she could be making an irreversible mistake. She leaves Leo's place & calls Andy, who has flown to New York to find her. The choice between what is and what could have been is the theme throughout this book. I really enjoyed the writing style.