Based on your behavior it does NOT sound like you want this guy to leave you alone. Of course, he is going to continue coming on to you as you flirt back. You are not a victim of the situation or of your flirting.

I think you need to get honest with yourself and decide what you want. You can't have it both ways. It is not fair to the guy for one thing. He does not believe a word you say given your flirting.