Why do men play mind games with women?

I saw man looking at me for awhile. I asked him why he kept looking at me. He said the looks had no meaning. I did not ask him but he voluntered to let me know that he was not interested. I told him to keep away from me. He proceeded to now go out of his way to be friendly to me. I could not shake him off. I totally ignore him now, yet still he tries to be friendly and still continue to look. He behaves as if he is not comfortable with me not greeting him. He says that he will try to ignore me, he has not. but insist that he is not interested.

because women play heart games with men...