It was this night that he told me the strange story of his youth with Dan Cody—told it to me because “Jay Gatsby.” had broken up like glass against Tom’s hard malice, and the long secret extravaganza was played out.

from F. Scott Fitzgerald – The Great Gatsby (Chapter VIII) on Rap Genius

Meaning

The information about Gatsby’s life that Nick relates in Chapter 6 — Nick learned it all at this moment, the morning after Myrtle’s death.

The violence of the previous evening (and Tom’s regaining of power) have basically destroyed Gatsby’s idealistic dreaming, and he is able to finally be honest to Nick accordingly.

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