Early 2000’s I believe. The story is based in Dublin, a woman discovers her husband is having an affair with a younger woman. Instead of confronting him, she finds out more about the affair by befriending the other woman. She follows them to Paris with her best mate (who I am sure is called Sylvia) and her mother is a strong character in the story.
She ends up having empathy for the other woman, as she gets treated badly by him too.
The husband works in art if I remember and the other woman is a beauty therapist.
I am sure the book had a yellow cover too. I really want to read it again - can any one help??