Judith Gould: The Best Is Yet To Come [2003] paperback

Carolina Mountcastle has the perfect life: a husband who loves her even though he travels frequently to Amsterdam, a great son, and a growing party-decorating business. Caroline's work is attracting the attention of New York's elite thanks to loyal customer Seth Foster, but along with success comes the envy of society member Payton Fitzsimmons, who wants to open her own decorator shop. Just when the spoiled heiress enacts a plan to sabotage her competitor's efforts, fate brings Carolina even more grief. After her husband suffers a fatal heart attack in Amsterdam, Carolina learns not only that he had an affair but also that he has a three-year-old daughter. The betrayal is a devastating blow, even though Carolina can now see the cracks that had developed in her marriage, and her perseverance is tested time and again as coworkers and friends desert her. Seth is the one constant. He's always been attracted to Carolina and she to him, but is she willing to trust again?