Take a chill pill, and just play it by ear. Despite whatever has been communicated between the two of you, you are under no obligation to be "nice", or "hospitable", "in a good mood", or to fuck his eyes out.
Have fun meeting someone in person you've only known otherwise, but don't think you're obligated to make it more (better) than it turns out to be. He's the one who made the decision to make the trip, you don't need to manufacture any responsibility of your own that he feels it was worth it.