Learn what "was the one" means, when people say it, and how to use it naturally in English.

It means the speaker admits responsibility for sharing the information.
From Mafia Lord'S Son Has Secret Love For His Stepmom, Episode 50
Someone admits they were the one who gave information to the Don.
Use this when admitting you gave someone information. It sounds serious and plot-specific, so it is better for explanation than indexing.
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