I am desperate to find a copy. It was written in the late 90’s ish.
Based in Dublin, a woman finds out her husband is having an affair. She chooses not confront him but to befriend the other woman.
She travels to Paris, where she follows them
she ends up become good friends with the other woman who she discovers is being beaten by her own husband
she’s got a best mate called Sylvia.
the husband is arty and fancies himself has some literary sort
does this ring any bells??