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

It means the speaker regrets their behavior and cannot explain why they acted that way.
From Rosy Psycho, Episode 50
Someone is admitting regret and confusion about a past decision.
Use this when apologizing or expressing regret after a bad decision. It is very common and natural in emotional conversations.
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