What are the behaviors that turn a guy away from a girl? What should I do to keep him away from me?

Anonymous
He is a good person. Very loving, kind, pure-hearted, emotional. He has been my friend for years. I have known him for a long time, but I consider him a good friend.
I don't feel anything towards him. I never approached him and I didn't use nice words. I didn't care at all when we talked. So I didn't give any hope. And I was surprised that he confessed his love to me. I told him I didn't love him.
Still, he doesn't give up on me, he tries to persuade me. But I do not want. I say "I'm not a good person" to keep him away from me. He does not understand. I can't be mad at him because he's not a bad person. We've been friends for years, so he knows I'm a nice person and he knows me well. I want him to get away from me without being hostile to me. No matter what I do it doesn't stay away. I refuse but he still says he will wait. And he hasn't given up for months. I am bored. I want to slap him but I can't... I want him to get away from me without hurting him. What are the things that turn a guy away from a girl?
What are the behaviors that turn a guy away from a girl? What should I do to keep him away from me?
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