Answer:
He tells the reader in Chapter 1, he is tolerant, open-minded, quiet, and a good listener, and, as a result, others tend to talk to him and tell him their secrets. Gatsby, in particular, comes to trust him and treat him as a confidant. Nick generally assumes a secondary role throughout the novel, preferring to describe and comment on events rather than dominate the action.
Explanation:
to react what happened and he wants to prove that the boy is not the killer
I believe it is a autobiography because it is told by the person because they know all of the details and events that happened...? I am not 100% sure I am just trying to help.
