what should I do about this creepy boy at school?

[person]

Well, when I was in 8th grade, I joined a swim team and got to be friends with this guy. but then he started hinting that he 'liked' me, and acting a little weird. I got freaked out and stopped talking to him, and admittedly wasn't very nice to him. but then, all through the year, he wouldn't leave me alone. Like he would follow me to lunch with my friends, and once I really wanted him to go away, so I left. but he was chasing me, and eventually I hid in the girls bathroom all lunch. And once at my swim team, the whole time he wouldn't stop talking to me... like when the coach was talking he'd be telling me stuff, and I got really agitated trying to stop him doing that, and eventually another coach had to take him out. So then the next year, he still ate lunch with my friends and I, although it wasn't so bad. but I never was nice to him, and I can't talk to my friends about it because they like him (as a friend), and get mad at me for not liking him. But this year, 2 years later, he still does stuff like sit uncomfortably close to me at lunch, and at lunch he stares at me all the time. and today, he kept asking me why I didn't like him, and he kept asking me over and over, and in front of my friends he tried to get me to admit that I'd 'liked' him once and still do. Eventually I just broke down and left crying. It's making me uncomfortable at school, and making me enjoy spending time with my friends less because he's ALWAYS around. he even joined every single school club I'm in. Also, my friend christina said that he told her he liked me. What should I do? I think I've made it clear I don't like him being like this, and I don't know if I should talk to my school counselor or what... please help!