"Je l'aimais" is a French novel written by Anna Gavalda. The story follows Pierre, a middle-aged man who finds himself reflecting on his past while spending time with his daughter and her family in the countryside. As he recalls a time when he was in love with a woman named Mathilde, Pierre begins to question his choices and the nature of love itself. Through flashbacks, the reader learns about Pierre and Mathilde's passionate but complicated relationship, and how it ultimately shaped the course of their lives. "Je l'aimais" explores themes of love, regret, and the passage of time, offering a poignant and introspective look at the complexities of human emotions.