Learn what "i knew nothing" means, when people say it, and how to use it naturally in English.

It means the speaker regrets trusting the other person despite not really knowing them.
From Revenge On My Cheating FianceÌ, Episode 48
The speaker is expressing surprise that they trusted someone they barely knew.
Use this in an emotional confrontation or breakup when you want to show regret and disappointment. It sounds dramatic and intense.
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