Books like Another Marvelous Thing

This is the third Colwin book I've read. I embarked on reading her books because I loved Happy All the Time. However, I am disappointed so far in her other books. I found this one to be very mediocre. There were a few problems with this book, I think. The main one is that there was something uneven about the arc of the story. Most of the stories were redundant descriptions of the affair between Frank and Billy, but then all of a sudden, the story shifted into the life and perspective of Billy. I think the whole book actually should have been one short story about the affair. My other complaint is about the character development: Billy is so mean to Frank (every word out of her mouth is sarcastic or demeaning) that I found it hard to believe he would be so devoted to her. And I also found it hard to believe that Billy would be able to move on to a relatively happy and stable relationship with her husband with this huge secret between them. In any case, there was something that kept me reading -- something about the mood and the language that was moving -- so I am giving it two stars rather than one.