Usain Bolt never proposed to his girlfriend after all-TMZ reports.

Usain Bolt ain't THAT fast ... he is NOT racing down the aisle to get married -- despite a photo going viral -- TMZ Sports has learned.
The pic shows Usain and Kasi Bennett in Bora Bora -- freshly lei'd -- with a Snapchat caption, "She said yes." Well, that's only half true.
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