What happens in robbie sells rex in victorious?

In the "Victorious" episode titled "Robbie Sells Rex," Robbie decides to sell his puppet, Rex, after feeling frustrated with their relationship. He believes that Rex is holding him back, but soon realizes that he misses Rex and the bond they share. Robbie tries to buy Rex back, leading to a comedic series of events that highlight the importance of friendship and the challenges of growing up. Ultimately, Robbie learns that he can't simply discard parts of his identity.