After Gatsby's private conversation with Daisy, how has he changed?
In Chapter Five, with Nick's help, Gatsby arranges a meeting with Daisy. This is the first time that he has seen Daisy in almost five years and before their private meeting, he is extremely nervous. Nick describes him as being "pale as death," for example, and "acting like a little boy" around her.
After being left alone with Daisy, however, Nick is struck by the change in Gatsby's appearance and demeanour:
"He literally glowed; without a word or a gesture of exultation a new well-being radiated from him and filled the little room."
Gatsby is, therefore, energised by his private meeting with Daisy. His nerves are replaced with confidence and his ill mood replaced with happiness and contentment. In addition, he returns to calling Nick "old sport" and comments that it has stopped raining. He also invites the pair over to his house.
Gatsby has been waiting for a reunion with Daisy for years and, for him, this private meeting is like a dream come true.