He thought I was a virgin!?

A guy I really like and have been seeing asked me how many guys I've slept with. I told him 1. And he couldn't believe it. He thought I was a virgin. I'm 25. And he kept asking if I was sure I wasn't lying bc he could swear I was a virgin. He disclosed his number before I did (his # is way higher than mine) and he thought I was lying bc his number is higher than mine. Wtf. Idk if I should be offended or not?