Do I really like her?

I like this girl, I don’t know her that well but I’m trying to learn more and whenever I find out something new about her it just puts a smile on my face. She has this smile that’s amazing and I wish that I could be the one who puts that smile on her face. But there’s also an empty feeling whenever I think about her because I know that we wont ever be anything more cause I know she likes someone else. There’s also the feeling that maybe I just like her to like someone, to have my mind and attention on someone other than me.