Most Helpful Guy
He's more relaxed and you tend to be wild and/or energetic. He may also be afraid that if he gets in a relationship with you, you will leave him or cheat on him for someone who fits your lifestyle (fun, wild, energetic).
Most Helpful Girl
It means he doesn't like you. Don't over-think the whole thing. Guys call women crazy all the time for the most immature reasons, ignore him.