Victor and Rosalie in Jealousy

After Rosalie recovers from the mumps, she finds her best friend Victor playing with another girl, Sophie. Jealous, possessive, enraged ... Rosalie is confronted with all the things grown-ups deal with. But Rosalie learns that sharing is not only about sharing possessions but also people, and that only misery comes from trying to own another person's affections. Eventually the two girls discover they are BOTH vying for Victor's attention and try to be more like each other, see the humor in the situation, and become friends. (And after all, if Victor likes BOTH of them, they must have some features in common.)