I love someone in the college and I don't know him at all ether he don't know me.
I just foll in love with him. He is so nice, every time he set in the library and study.
And when I don't see him once a day then I get worried about him.

You can't really love someone you don't even know. Maybe you are just infatuated with him.

What should you do? Maybe try talking to him?