The guy says he's not interested, so treat him as if you're uninterested. That will make you interesting to him. First you want him, are all into him, and then you give him exactly what he gave you. His chase will really be on then.
At that point, you tell him you're not ready to be in a relationship with someone who isn't ready to be in a relationship. And then let him stew on it and see what happesn.