Ok...
Revenge to me is fun.
So, I would take advantage of this situation. YOU have the upper hand and can make her life hell. So why not do it?!?!?
Here is what you do.
1. Download and save all of her messages into a nice TXT file.
2. Organize it so it makes sense.
3. Send it to all guys she has been messaging from an new unused account.
4. Send it to her friends and family form the same new account.
5. Call her on the phone, tell her "I am so sorry I broke up with you, I miss you, I love you I really want to be with you! I will do anything to be with you I am so sorry".
6. (This is where it gets good) Talk her into meeting with you some place. Very public, mall, whatever "just to talk"
7. When she gets there have the TXT file and the sent messages printed off. Talk to her for a little bit and tell her you have a BIG surprise for her. When she can't wait any more hand her the papers. Watch her read them.
8. Get up leave and laugh all the way to the car.
It is one thing to enact revenge....
It is another to enact revenge while watching in person someones world destroyed...