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 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 - am any help??