Vital Temptations by K.L. Lewis

Bethany thought Brent was the perfect man. But there's a catch... Smart, beautiful, and wildly successful in her career, Dr. Bethany McNeal had it all. Living her dream as a pediatric resident in Seattle, she found herself falling in love with Dr. Brent Anderson, a charming and handsome fellow resident. There was only one problem: he's married. After discovering Brent's shocking secret, Bethany parts ways and moves on with real estate broker and personal trainer, Charles Blakely. Torn between two radically different men, Bethany is suddenly faced with a series of difficult decisions and harrowing events that will change her life forever.