She sees you only as a friend.

If the girl you are try to get with either isn't single, or seems to only want to be friends. Don't give up complete hope, give it time.. but only wait if you REALLY love her.

Always show your still interested, but don't come on too strong, tell her she's beautiful, be there for her when she needs someone to lean on. It may take awhile.. but the one I love seems to be warming up to me.