Adult Crime/ Thriller/ Romance. Hit and run, driver then starts relationship with bereaved mother.

[Diane]

A young child (boy?) is killed in hit and run accident. Parents split up. Years (?) later, the driver starts a relationship with the mum of the child who was killed but doesn't tell her he was the driver.

[Kris]

Diane, what are the main characters' jobs?

Can you describe how the hit-and-run accident occurred? Location?

How does the driver meet the mother?

Around what year did you read this book?