If He Had Been With Me" is a young adult novel written by Laura Nowlin. The book tells the story of Autumn and Finny, two childhood best friends who grow up together and face the challenges of adolescence. Despite their closeness, they both struggle with their feelings for each other, which they keep hidden from one another. As they navigate their way through high school, they find themselves drifting apart and pursuing different paths in life. However, a tragic event brings them back together and forces them to confront their true feelings for each other. The book is a heartwarming and emotional journey of love, loss, and the power of friendship.