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

It means the speaker thinks the other person acted immaturely or irresponsibly.
From Billionaire Daughter’S Love Triangle, Episode 19
Someone criticizes another person's behavior as childish or irresponsible.
Use this in an argument or serious conversation about behavior and responsibility. It can sound harsh or insulting, so avoid it in polite settings.
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