Sometimes it’s hard to make people clear that you don’t feel the same. And I guess he will regret it as soon as he won’t be in love with you any longer. I understand that you feel uncomfortable. At first it would be good to talk about it with your friends or your family. I don’t know how old you are but maybe your parents can help you?! If he REALLY doesn’t stop, say that you will go to the police. Maybe that will open his eyes. If not, GO to the police. I know this will be hard because he’s just “in love” and you (I guess?!) don’t know him that good. But he probably won’t understand, you know?
I hope you will find a good solution, and don’t panic too much! xx