"And she doesn't understand," he said. "She used to be able to understand. We'd sit for hours-"
Gatsby is struggling to accept that things and people can change in 5 years. He expected Daisy to just leave Tom and fall back in love with him the second she found out he was rich, but she is having trouble making a decision on what to do. Nick is aware of this because he is a fairly reasonable man. But Gatsby is so set on recreating 1917 and the love he and Daisy had before he went to war that he is almost detached from reality. This is where we learn that even with all his charm and wealth, the “Great” Gatsby is still greatly flawed and somewhat delusional.
To help improve the meaning of these lyrics, visit “The Great Gatsby (Chapter VI)” by F. Scott Fitzgerald and leave a comment on the lyrics box