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When Jordan emerges from her meeting with Gatsby, she tells Nick she has “just heard the most amazing thing,” which she “swore” she would not tell.
Why should Nick doubt that she has learned anything interesting?
Gatsby is notoriously private and would not be likely to share anything with a relative stranger.
Nick knows that Gatsby was interrupted several times during his conversation with Jordan and didn’t have time to tell her anything.
Jordan has a reputation for being dishonest, including a possible incident of cheating in a golf tournament.
Nick was waiting outside the door during the meeting, and he knows that Gatsby did not tell Jordan anything interesting.
Nick spoke to Gatsby earlier in the evening and knows what he planned to tell Jordan.