In Chapter 6, Nick takes on a cautious nature, he becomes Gatsby's confidante, learning more about the man of mystery than he wants to know. He is fearful for Gatsby, knowing how intense the man feels for Daisy. The chapter is narrated with anxiety and worry, there is intensity in Nick's narration in this chapter, the final paragraph conveys Nick's feelings of confusion and fear.
"Through all he said, even through his appalling sentimentality, I was reminded of something, an elusive rhythm, a fragment of lost words, that I had heard somewhere a long time ago. For a moment a phrase tried to take shape in my mouth and my lips parted like a dumb man's as though there was more struggling upon them than a wisp of startled air. But they made no sound and what I had almost remembered was uncommunicable forever." (Fitzgerald)
In Chapter 6, Nick Carraway narrates the truth about Gatsby's background, Fitzgerald gives us this information because Daisy and Gatsby were previously reunited in Nick's home. In this chapter, Gatsby meets Tom Buchanan and both Daisy and Tom attend one of Gatsby's parties.
Nick becomes Gatsby's confidante, he is the only person that Gatsby can talk to about his love for Daisy. And after the party, Gatsby feels that Daisy did not have a good time. For all the mystery about Gatsby, Nick gets to hear the whole truth from the man himself.
I'm not so sure that Nick wanted to be Gatsby's confidante, it made him uncomfortable to be between these two tragic lovers and to have to look at the angry face of Tom Buchanan knowing what he knew.
He tries to be caution Gatsby that as much as he and Daisy felt for each other in the past, that the past is the past.
Nick says: "I wouldn't ask too much of her, You can't repeat the past." (Fitzgerald)
Nick is trying to be the voice of reason in this chapter, he is worried, afraid for Gatsby, he knows that Tom has a really bad temper, and has expressed extreme dislike for Gatsby. Tom does not trust Gatsby, he sees him as a phony, not a real rich person like him, Gatsby is new rich, Tom thinks that Gatsby made his money in bootlegging and has no respect for him.
In Chapter 6, Nick is still rather objective as a narrator, but he is unable to hide his disdain for Tom Buchanan. His nature or characterization is that of an interested spectator, but Gatsby and Daisy have managed to entangle him somewhat in their issues.
Nick's tone changes throughout this chapter because much of the novel's significant background is revealed.
1. First, as Nick flashes back and tells Gatsby's real history as James Gatz, he is slightly sympathetic. For the first part of his account as he describes James Gatz's encounter with Dan Cody, he actually seems like a reporter. But, as he continues and comes to the part when Gatsby met Daisy for the first time, he demonstrates some sympathy for the young, hopeful man who pins all his dreams upon the idea of socialite Daisy Buchanan.
2. As Nick returns to the present by describing Gatsby's party that Tom and Daisy attend, his tone shifts to critical. He is critical of Tom Buchanan's snobbish attitude and hypocrisy. He is critical of Gatsby's guests who take advantage of their host and act like wild animals. And, he is critical of Gatsby who thinks that he can go back and repeat the past or change the past to be what he so desperately wants it to be.
3. Finally, as Nick leaves the party, he tries to remember a phrase that he had once heard and cannot do so. At this point in the novel, he is starting to show how the East has already begun to corrupt him and has caused him to be disillusioned.