If you feel "romantic" feelings for someone, that isn't going to go away unless they spoil those feelings by not being someone you would have interest in. It can be easier if you are with someone you prefer being with, but it will still be there.

Just move on and stop trying to be her friend. Your feelings towards her that aren't shared are going to make things unfavorable and she isn't going to come around and want you as a romantic partner.

Just be casual friends that see each other at martial arts or through mutual friends and nothing more.