Some people (not judging, just commenting) think it's cool to have an opposite sex "good friend" who they can hang out with, have sex with, and have no strings attached. Sounds like you are not the type of female who would want that. But you also sound like a smart chick, so follow your mind - not your heart (hearts are notoriously dumb, and pig-headed), until he shows his heart to you, and you trust each other.

em