One way the author shows the theme is when Angie supports Pete. In paragraph 13, Angie says “Don't worry, you are the best singer in the school”. This sentence reassures Pete and shows that Angie supports Pete. Also in paragraph 33, Angie tells the media coordinator that she missed the clip of him messing up, which makes Pete feel way better and shows how Angie is supportive of Pete which makes him feel better about himself and then wants to keep going and do the halftime show.
At the end of the story, both friends solved the issue and were both happy.