As though a faint doubt had occurred to him as to the quality of his present happiness.
Gatsby could be bewildered by his love for Daisy, finally becoming real in the flesh and blood, or it could be revealing the true nature of Gatsby’s feelings. Now that Daisy is with him, she is more real than the Daisy that he’s been building his life up to impress for the last five years. Five years is a long time, and people change, and the Daisy he loved before may not be the same Daisy that is with him now.
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