Learn what "i don't know" means, when people say it, and how to use it naturally in English.

It means the speaker is blaming themselves for acting foolishly or making a bad choice.
From Married To A Stranger, Episode 60
The speaker criticizes themselves for making a very foolish mistake.
Use this when you regret a mistake or feel embarrassed about your own actions. It is emotionally strong and sounds self-critical.
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