How do I get revenge on a girl "friend" who broke my heart?

Anonymous
I have always liked this girl that I have been friends with for many years. I am 99% sure that she used to like me a while ago and it should have been really obvious to her that I liked her. Well here's the thing I was really wanting to ask her to prom but I can't because she is going with one of my best friends and the WORST part is that she asked him. I have been ignoring her ever since I found out because I couldn't deal with the fact that she had no feelings for me at all (even though she always acted like she did). Ever since I started to ignore her, she has seemed to get gradually more confused and mildly upset as to why I didn't want to talk to her.

She told one of our mutual friends that she thought that I was mad at her (which I obviously am) but I denied that and talked to her on that day just to get her from confronting me so it wouldn't be awkward. But I want her out of my life for good so I'm going back to avoiding/annoying her. Girls, please give me help with this: if you had a good friendship with one of your guy friends than what could he do to make you upset and make you realise that he doesn't want anything to do with you (I'm not trying to be a jerk, but trust me she deserves to get hurt)
How do I get revenge on a girl "friend" who broke my heart?
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