How should I answer whenever a girl asks about my datting history?

There's been a couple of times where a few girls asks me about any exes or how many relationships I had? I get quiet, shy, or say none but they ask me more deeper questions?

My friends say that I should say "the only ex I had was with you?"

How should I respond to that when I don't have any experience in dating 🤔

How should I answer whenever a girl asks about my datting history?
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