A: Just tell him straight out that you guys were never going out and you'll most likely never will. If he doesn't get the picture then treat him like you would treat some random creep.
Describe your ideal first date; Where do you go? What do you wear? How does the date end?
My ideal first date would be first we go to the movies and see a comedy after we would go somewhere slightly quiet but still fun so we can talk and get to know each other.