Gut feeling=somethings creepy about the newest guy in my picture-is he a creepo or am i just being jaded?

Met a guy online while looking for roomates last summer. I decided i would rather live alone, but kept conversation up with him online and eventually text. Eventually went to the movies with him, felt like something was off (maybe creepy?) about him. I was intrigued however overall, and we continued to talk...things got more normal as we became more in sync. We are dating now, but i still have that weird feeling. I think it may be just be because i know no one he knows and have no character reference point, or it might be because hes just creepy! whats a good test to know the difference?!