Why the guy I was making out with asked if I did it with my ex?

With the guy I like we were watching a movie.
I moved next to him, we kissed etc and he asked me "did you do all those things with your ex too?" Things meaning touching me, kissing me, hugging me and obviously sex.
When I said no he was like ok.

why would he ask it? Does it matter to him?

Why the guy I was making out with asked if I did it with my ex?
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