Learn what "i'm not sure" means, when people say it, and how to use it naturally in English.

It means the speaker does not know the best way to support her right now.
From Mysterious Murderer, Episode 8
The speaker admits they are unsure how to support another person through a difficult situation.
Use this when you want to express uncertainty about helping someone in a tough situation. It sounds natural in conversation but is not a strong standalone phrase page candidate.
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