In chapter three of The Great Gatsby, Nick has been hand-delivered an invitation to one of Gatsby's parities. Other people just seem to show up and are never invited. They take advantage of Gatsby's great wealth. Nick, on the other hand, gets personally invited so he decides to go. Once he is there he looks for Gatsby with no success. Nick meets Jordan Baker and the two strike up a friendship. Everyone is dancing and having a good time. Nick and Jordan are seated with another couple and strike up a conversation. The other man tells Nick he looks familiar and asks him if was in the war. The two men talk about the war and start a conversation.
"We talked for a moment about some wet, gray little villages in France. Evidently he lived in this vicinity, for he told me that he had just bought a hydroplane, and was going to try it out in the morning."
We learn that the man is in fact Gatsby himself. Gatsby just talked to Nick like any other guest at the party. It goes to show us that Gatsby is not the type to just announce who he is. Everyone wants to know the elusive Gatsby, but Nick is the first to see the real man. He is not there to use Gatsby or take advantage of him. Nick is, and will be, Gatsby's one true friend.