A story! I love stories! Especially Boy meets Girl stories! Yay.
Oh, this isn't a romantic comedy.
There is a big difference between "creepy" and "harassing" or "threatening." There is a middle ground between "creepy" and unwanted texts and involving the cops. You need to, in an unemotional, clear, and direct way, tell him that he is making you feel uncomfortable, and he should not contact you. Redundant? Yes. But draw a fortified boundary, complete with a moat and barbed-wire. Don't allow him to "interpret" what you're saying. Don't be nice. Don't be a jerk. Just be direct with him.
Keep every single one of his texts. Also: don't keep this to yourself. Alert your friends and family that there is a douche who is a little too into you.
Finally, I will say trust your gut. This guy could just be a lovestruck, emotionally-stunted dumbass who will get bored. He could be a cocky fratbeast who's ego won't allow him to accept that some chick isn't into him. That guy might get bored. He could also be am abusive stalker with no sense of personal space. Call the cops the moment your gut says "Freak has gone too far." Then talk to them.
Until that moment, let us learn a valuable lesson: don't date people who live in your apartment complex. Life is not a sitcom.