What is I promise i won't tell?

The biggest lie anyone has ever told; everyone has used this at least once

Person 1- I can't tell you
Person 2-I promise I won't tell
Person 1- ok but you can't tell anyone
Person 2- I won't
..later on
Person 3- what did they say?
Person 2- yup he likes you

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I promise i won't tell - video