I've been in a similar situation, so i know it sucks. i liked a guy who liked me until another girl came into the picture, all i can say, is Emily is right maybe you need to show her how you feel, whether its through a poem or some other way.
There are many ways but choose one (the right way for you) and let her know. in my situation i didn't do anything and i lost him, maybe that was the way it was meant to be but now i'm left wondering what would have been different.
Even if it doesn't work out the way you want it to, at least you won't be stuck like me, wondering and regeting
With God I am happy; sadness has no say in my life.