... it would be the Bridge to Terabithia, based on a novel of the same name. A boy named Jess who used to be alone and seemingly less important among siblings was befriended by a girl, Leslie, and together they spent their time on a fantasy world they imagined. All was well until Leslie died. Saddened, Jess kept regretting his choice on that fateful day to be with his teacher who had a crush on.
Just imagine being alone all these years and then someone came to answer your silent call for company. But suddenly, death, the eternal parting of ways, happens.
This is the movie for those who value friendship the most.