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

It means the speaker is unsure about how she is doing physically or emotionally.
From The Dumb Billionaire Heiress In Love Part I, Episode 29
The speaker is saying they do not know the other person's condition or situation.
Use this when you want to say you do not know someone's condition. It can sound formal or serious depending on context.
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