Why hasn't he asked me out yet?

I'm in college, and I've had class with this guy I like for the last 6 months. My gut tells me that he finds me attractive, but I'm confused as to why he hasn't asked for my number yet. He's not a shy guy at all... which is why I'm thinking maybe he's not interested.

We only talk a little here and there, but he definitely comes to me and starts the conversation. However, he runs away too quickly before we can talk about anything more than school. He doesn't seem to pay attention to any other girls in the class except me. I see him checking me out sometimes, and I also notice that he parks his car next to mine now. So why hasn't he made a move yet? The only reason I can think of is maybe I'm a bit too shy or quiet for him.. I'm not sure if I come off as un-approachable? Could this have something to do with it? Or else maybe he's just waiting for the right time?

Are there any for sure ways to tell if the guy is interested?
Why hasn't he asked me out yet?
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