HOW CAN I GET MY EX-GIRLFRIEND BACK? I LOVE HER<3?

Well it all started in November 1st, 2011, it was a long distance relationship but I would go visit her 50 miles away from my home by train just to see her. I went twice during our relationship it was a surprise to her the first time. But we would miss each other a lot, I would always call her on the phone no matter what day it was, even if I was busy. I really loved her so much! We lasted until January 3, 2012, she told me this wasn't going to work out because of long distance, it was tough to accept but I has too, I would always tell her that I'll make it possible for her not to worry about that but it's hard because I'm 17 years old and it was pretty pricy to go by train, I don't drive very far either:( After the day we broke up we still kept in contact, I would call her everyday like as friends. We would talk late, I still felt and still feel the same for her today after what she did:'( During our relationship she told me this guy a had a huge crush on her before I met her, but she didn't like him. While, we were friends I found out that she was "married" to him on Facebook, both of them posting hearts, sweet post on each others wall. She never did that to me when I was in a relationship with her because her parents "didn't want her having a boyfriend" so we kept it a "secret". But now that she is doing this to him when there friends and not me that I was her boyfriend hurts me so much. Trust me people reading this I was thinking the worst that night. Oh, I forgot to tell you all... he added me on Facebook saying that my ex-girlfriend got on his account and added me (I looked at his profile info and that's how I found out he was "married" to her) So I called her saying what the heck was that all about and she just hanged up on me. So I cussed him out for taking away what was mine, then he blocked me. I was desperate those days that I even made an account of someone that doesn't exist on facebook adding my ex-girlfriend and the guy she "likes". They don't know it's me. But I don't know what to do anymore:( I want her back even though what she did to me, this might sound stupid but I still love her.