Help me please!?

This guy I know likes me a lot. We have always been really close friends. Since he told me he liked me he has been giving me more hugs and txting me more. I told him I didn't want a boyfriend and just wanted to be friends. He was cool with it. Then he said that things wouldn't change very much. When I thought about it we do act like we are going out the only thing that would be different is we would kiss. I don't know what else I can do to let him know that I don't want to be as flirty and close and just friends. Any ideas?