I think that it's fine to see him on Wednesday. If he asks you out again you might ask him what he's looking for. Is he looking to be in a committed relationship? Does he want children? Where does he see himself in the next 5-10 years? I know that you are trying to remain friends and I think that you have shown him a boundary. If he tries to push against that boundary, asking him serious questions may make him think twice about things. You could say that although you are not looking for a dating relationship right now, but if you were you would want to date someone who was looking for a serious relationship. He may not have that in mind at all, just wanting someone to have fun with. That is fine too, but just keep in mind what you want the end result to be.