My guy friend said I was his girlfriend but I don’t want a boyfriend

So I know it was a joke but when my guy friend and his mom came over we all had a chat and caught up since we know each other well.
My dad asked my guy friend if he had a girlfriend and he said no. He was like why not. He looked stroked. Then he said that I was his girlfriend. My face got bright red. I was like, “Oh we’re a thing now?” His mom said, “Well you know now.” My dad hugged him. I know they’re just joking but now I’m kind of upset. Nothing wrong with my guy friend but I don’t see him that way. I never dad. I know he liked me back then but he never called or asked in on a date. He asked he to go to the school dance several times. I did go with him twice but we’re JUST FRIENDS. My dad knows I’m single. What if my guy friend really asks me out! I love being single.