Nagging question là gì

Hello. I am wondering about the exact difference/s between a "nagging question" and just a regular question.

Context: on this other board, a girl was wondering why a guy who pursued her previously suddenly lost interest. Someone said this: Let me ask you this. Is the nagging question as you may have said, more trying to figure out the perplexing nature of this person's response? Or, do you have a gut feeling that all is not really being expressed by him?

Thanks!

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