Why do some girls reject guys they like?

I hear it's quite a common phenomena that happens. The girl will like the guy but if the guy asks her out he is then rejected. I know that they have the right to reject but why develop the feelings in the first if you're just going to selfishly reject the guy anyway. Some like to play games and some just are narcissists. Why would some women reject someone they like?
Why do some girls reject guys they like?
Post Opinion