KKLT - I dunno how to help you in this case. Sorry. I feel bad cuz you've always given me great advice, but when you need help I can't give it to you.
I've never been through this kind of case before... so I can't really help you. Sorry.
I'll try to help, though... Maybe you can tell all your other friends that the guy keeps bothering you and you don't want to be around him.
Because you're popular, you get to say what you want and your friends will follow. That's the good thing about being popular.
I don't know what else to say, but...
Maybe you should talk to Pyre & Cure-kun. They'll know what to do.