The Waiting Heart by Marcia Miller
Description from the book back cover:
As usual, when covering a wedding for the women's page of the San Francisco Globe, Gilyan Barr sat in church dreamily picturing herself as the bride and tall, handsome Jay Hanover as the groom. Was it only a week since Jay told her he loved her ... only yesterday that he'd left to cover the World Series? Then comes the news that Jay has eloped with very rich, spoiled Nancy Covington - a woman who changed husbands as she changed fur coats. Gilyan told herself to forget Jay, but how could she when her heart kept whispering that he was the only man she could ever love?