I'm Looking for a Book. I Want to Read About the Kind of Couple Who Have a Baby, Want to Divorce, and Then Get Back Together Again.

I'm looking for a book. I want to read a story about a couple who has a baby boy, wants to divorce, and then gets back together. It can be tortured. I've seen a story about a business marriage with a three-year-old baby boy, and they got divorced and got back together.