Widow writes fictional account of discovering husband has cheated, and has a dominatrix in another city

[Pam]

Looking for a book by a female author, whose novel (I believe it was a novel) highlights the events of her widowhood: discovers that husband had multiple lovers, has given her a sexually transmitted disease, and may be visiting a dominatrix in another city. The book would be between 10 and 4 years old (published 2014-1019. Possibly set in the Hudson Valley.