How do you respond to a girl when she want's to know about your past relationships or exes? What if you don't have any then it becomes awkward?

This happened to me the other day, it got super awkward because she was just questioning me more and I had no answers. Didn't help that I was embarrassed by it and felt a little bit uncomfortable. 😣😖😖😖

How would you have responded or said differently of you were in my shoes?
How do you respond to a girl when she want's to know about your past relationships or exes? What if you don't have any then it becomes awkward?
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