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

This means the speaker regrets a past decision and admits it was foolish.
From The Dumb Billionaire Heiress In Love Part I, Episode 8
Someone admits they made a bad or confusing decision earlier.
Use this to admit regret or explain a bad choice. It is common in apologies and self-criticism.
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