Okay. Kinda Creepy. Should I be like, Scared?

Sounds like he has a crush which is dangerously bordering on obsessive / stalker. If he keeps haring you then you should definitely tell someone but warn him first. "If you don't stop, I will tell _____ " (your parents, his parents, your body-builder boyfriend/older brother/uncle etc...). Just the warning is usually enough to get guys like this to back off.