What does it mean if a guy kisses your hand?

This guy and I have known each other for a little over a year, but we've been talking a lot for the last three or four months. We've hung out in person maybe three times (so few because I go to school a few states away). Last night, he came to pick me up to hang out with some of our mutual friends, and he dropped me off last. I was sitting in the back seat and he was in the front. I could have moved to the front, but I was afraid to seem so eager. I'm really kind of shy. When we got to my house, he put out his hand as if to shake mine. I gave him my hand and he kissed it.

Does he like me? I mean, would there have been any reason for a 19 year old boy to kiss a 19 year old girl's hand other than a romantic interest in her?
What does it mean if a guy kisses your hand?
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