how to deal with it

There is nothing you can do. She knows how you feel. Now let her think about it.

Go on with your life. Let her see that you are a fine man and worth something. You may become attractive to her.

If a girl had a crush on you and told you that she loves you, but you felt indifferent enough about her to say 'You're wasting your time', and this girl kept up her infatuation with you...what would you think of the girl?

In what circumstances would you perhaps change your mind (disregarding any looks)?

What does she look for in a man? (ie. what traits in a man turn her on, and make her want a relationship).