Not That Kind of Girl, by Catherine Alliott, Headline Book Publishing, 2005.
I found this book in a thrift store recently and I thought it would be a fun read. And it was. And that's about all.
I didn't really "click" with any of the characters, except maybe Benji, the protagonist's gay brother, and Francis, his lover. They were stereotypically sweet and fussy, but at least they were engaging. The rest of the cast felt enough over the top to be more like caricatures instead of characters.
Also, her math kept driving me crazy. The protagonist kept referring to a fifteen year gap between being jilted and the present. But she waited a year before marrying, and had been married fifteen years. Also the son, who is fifteen, was born a year after the marriage. So the gap should have been sixteen to seventeen years. For the most part this disparity was just annoying, but there is a crucial part of the stories that refers to fourteen years as being shortly after the "jilting".
It's cracks like that that make this a fun, but not altogether satisfying, read.