How do I get this kid to leave me alone?

I'm 19 going on 20 this year and I'm Asian. There's this 18 year old boy asking me out. He's a millionaire believe it or not but I don't like him. Ever since he became a millionaire (I'm not gonna tell you how and he did not hit the lotto), a lot of girls started to date him. But each of the relationships don't last long. He's making it seem like "just because he has the money, all of the girls want to date him". He keeps asking me out and tells me how "obsessed" he is with me. He texts me everyday and I can't help but replying because I have no problem talking to him as friends but I don't want anything else to have to do with him.