Is Nick honest?
Nick Carraway is an honest narrator most of the time throughout the the story. This can be shown throughout the story. He is almost similar to a third person narrator because through most of the story he is a bystander who doesn't help the story. This can be shown be shown on page 96 when Nick says "They have forgotten me." Throughout the story, Nick sees what goes on in the lives of people around him and although he interacts with the world and helps Gatsby do what he needs to do, he change what happens. Because Nick is so invisible to the world, he can honestly talk about the world around him. Nick can find the truth.
Nick talks about someone as he sees them, and he also infers what other people thinks which helps convey the story. For instance, on page 109, Nick infers that Gatsby wants Daisy to tell Tom that "she never loved him" and after she says that Gatsby will take her away. Gatsby himself doesn't say that until the end of the story, but Nick realized Gatsby's true feelings Long before anyone else.
Nick is an honest narrator and the story shows that fact. At important, driving moments of the story Nick goes quite and passive. Even when the other characters begin to fight Nick remains an honest narrator who sits and watches and relates it to the reader. This can be shown from page 130 to 134, when Gatsby fights Tom over Daisy. In that part of the story, even though Tom and Gatsby were yelling at each other with Daisy in the middle of them, Nick just stood watched and told the reader what they said. This is further proof that no matter what happens in the story, Nick is an honest narrator.