Any reason why he wouldn't want to be seen with me in public?

Anonymous
known this guy for a few months. we always hang out in spots or places that aren't public eye or a place he's never been to before (can't tell if he's just an introvert either). I can't find evidence that he has a girlfriend. I'm not ugly and several other men have no problem being seen with me in public. its just him.
he ducks and hides when gets out of my car to get something out of his car like a spy movie. we could drive by a group of kidds and he would duck. I asked him if he had a girlfriend and tells me no and gets mad because he's tired of me accusing/asking him that.
Any reason why he wouldn't want to be seen with me in public?
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