It's wrong to not believe your friends.
Noah tells Gary that Noah will lose his job because he saw some emails at work and the company is about to go bankrupt.
Gary wants to comfort Noah.
Gary tells Noah that it sounds pretty bad but that he'll bounce back and find another job since he's a good worker.
Gary tells Noah that he's making up nonsense and that some emails don't mean anything and that he'll be fine.
Noah is happy and relieved to hear that Gary thinks he's a good employee and that his reputation should land him another job.
Noah is annoyed that Gary is dismissing the evidence and that Gary's not seeing the gravity of the situation.