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

It means the speaker feels let down because the person turned out to be the same as others they distrusted.
From Mafia Lord'S Son Has Secret Love For His Stepmom, Episode 28
Someone is admitting disappointment because they expected a person to be different.
Use this after trust is broken or when someone's behavior disappoints you. It sounds natural in emotional conversations, but can feel bitter.
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