Given scene/plot descriptions from movies or TV shows, and given a specific question about the scene, summarize the question into a title
Q: In The Dreamers when Matthew tries to convince both Isabelle and Theo to not leave him, why don't they listen to him and join the riot? Both characters are really hard to understand but their thoughts portrayed in the movie are yet so simple and intriguing.
A: 
Why Isabelle and Theo leave Matthew in the end?