While I Was Gone 2004 on netflix

Jo Beckett leads a comfortable life with a successful veterinary practice, a devoted husband, and a beautiful home in a lovely small town outside of Boston. Still, she is strangely dissatisfied with her life. One afternoon, a man brings his dog into her veterinary practice to be treated, and Jo recognizes him as Eli, a former housemate from her bohemian days more than 20 years ago. When he invites her to lunch at a fancy hotel in Boston, she goes with the intention of sleeping with him. Instead, Eli reveals a secret to Jo that returns her to the darkest moments of her past and threatens to destroy life as she knows it.