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

It means the speaker is expressing amazement or sympathy about how difficult the other person's experience must have been.
From Mysterious Murderer, Episode 31
The speaker reacts to hearing that someone went through a hard experience alone.
Use this to show empathy when someone has handled a painful situation alone. It sounds caring and natural, but it is more emotional than everyday small talk.
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