help plz😁

Ashley
Ok so I need some help. Their is a guy that I have known since I was 3 and is suicidle. Well this guys thinks I am his girlfriend and won't leave me alone. I want to tell him to back off and leave me alone, but I don't want  him to hurt himself. WHAT SHOULD I DO I SEE HIM AT A ROBOTICS TOURNAMENT SATURDAY!!!!!😭😭😭😭😭😁😁