Everything you need to understand or teach Regretting You by Colleen Hoover.
In Regretting You, a novel by Colleen Hoover, high school sweethearts, Chris and Morgan Grant, have been married for seventeen years when a fatal car crash reveals that Chris was having an affair with Morgan’s sister, Jenny. To make matters worse, Jenny was engaged to be married to her high school boyfriend, Jonah Sullivan, who believed that Jenny's son, Elijah, belonged to him. More than likely, Elijah's biological father is Chris. Morgan struggles to keep her husband's infidelity with her sister a secret from Clara, the daughter of Morgan and Chris. After the fatal crash, Morgan and Jonah's behavior leads Clara to believe it was her mother who was being unfaithful to her father. Themes in the novel include coming of age, the intricacies of relationships, and the trouble with lies.