How would you feel if your girlfriend asks you if you're flirting with someone behind her back?

Context

It was a misunderstanding because of some texts

The moment he told it's nothing like that, I believed n didn't ask anything else

And I apologized a lot for doubting

He said he doesn't mind, n was only concerned if I'm feeling okay.

But I still feel bad

How would you feel if your girlfriend asks you if you're flirting with someone behind her back?
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