what is the theme in chapter 5?

The exchange between Nick and Gatsby that opens this chapter highlights the uncertainty at the heart of their relationship. Is Gatsby's friendship with Nick merely expedient? Is he merely using him to draw closer to Daisy ­ or is he genuinely fond of Nick?

The question cannot be easily answered: while it becomes clear that Gatsby has great affection for Nick, it is also true that he uses money and power as leverage in all of his personal relationships. Gatsby, in his extreme insecurity about class, cannot believe that anyone would befriend him if he did not possess a mansion and make several million dollars per year. Fitzgerald seems to bitterly affirm this insecurity, given the fact that Gatsby was abandoned by Daisy because of his poverty, and remains ostracized by the East Eggers even after his success. In the world of the novel, only Nick does not make friendships based upon class.