When the Christmas holiday has begun, how does Charlie react? Why does he react that way?

The sadness that Charlie feels during the Christmas season because of his Aunt's death creates an interesting juxtaposition with his feelings during the Secret Santa game. He is able to feel happiness when he is surrounded by his friends, but his wellbeing crumbles as soon as he is away from them. It is clear from these scenes just how much support Charlie gains from his friends - they are the foundation of his mental well-being. When Sam and Patrick leave for a family vacation at the Grand Canyon, darkness seeps into Charlie's life, and it is very difficult for him to fight his most troubling emotions.