I agree with
tippler to an extent. Has he said anything that would make you think he sees it as a date? If not, I'd just be ready to make it clear that you're not interested when the time comes. He starts to flirt, you might flirt a little. A little starts to become a lot, you simply tell him you're not into him, or that you're not ready to start dating, or whatever the case is.
You always put this in the CD player, and tell him you hate whiny little bitches who can't handle it when women aren't into them: