Learn what "why didn't you" means, when people say it, and how to use it naturally in English.

It means the speaker is asking why the person failed to warn them about staying up late.
From Rosy Psycho, Episode 41
Someone asks why the other person did not mention they would stay up late.
Use this when you are annoyed or confused about a lack of communication. It can sound accusatory if said sharply.
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