In the story he said “will we ever find an apartment” he was getting mad at people because he doesn't understand why they have a house and he doesn't. In the story he is disappointed that he has no house. But he tries not to show his emotion because he knows he will get caught. But early on you can tell he is mad from the way he acts.
Later in the story he turns frustration to hope when he see’s the bird get out of the airport. Then he thought it