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

This means the speaker is overwhelmed and cannot understand how the situation could have happened.
From Married To My Brother’S Ex, Episode 42
Someone reacts in disbelief because the situation seems impossible to understand.
Use it when reacting to shocking or confusing news. It is natural in emotional conversations, but it is not a practical question.
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