Tell Me Lies by Jennifer Crusie (St. Martin's Press, 1998)

Interestingly enough, this is set near Lima, OH. Never been there, but that town has some (unfortunate) personal significance.

From the back cover:
“Maddie Faraday’s life would be perfect—if it weren’t for her cheating husband, her suspicious daughter, her gossipy mother, her secretive best friend, her nosy neighbors, and that guy she lost her virginity to twenty years ago…”