How can I get my girl back?

I had a relation whom I have loved the most in my life. We both are working in same place and she’s 23, me 27. We have been working together since 9 months and in the Dec 2007, we had the relation and broke up in the Jan 2007. The relation stood up for about 10 days as real relation. because I felt she really have been loving me for those days. After that, I had to agree with her that she feels for some time of her own so that she can miss me and can explore of how much she loves me; because she kept telling me she don’t feel good wondering how much I loves her and what she’s giving me in return. She had one past where she was betrayed brutally around a year and half ago and still can’t forget him. I gave her the time and kept reminding every day of how much I love her and can spend and spare any ting for her also will wait my whole life. I should mention here, that I’m quiet introverted and since I joined in office (She started earlier) I never used to stare at her while she notices. Not even used to give her a look while she notices. After the relation she told me; that she was really attracted to me too, but just didn’t had a relation then and also asked me the question of why not stared at her ever? We never was a very good friend, just collogues. We are working in different department. But while passing her through, I even didn’t used to look. Doesn’t mean I was noticing some one else. I guess I pushed her too fast and actually showed her that she is the one I can do any thing for. We are broke now with the relation. I’m treating her the same way as used to while being colleagues and have tried every possible way to forget her. But it’s not just working. We don’t talk with each other now and I guess I started that first and I’d say we are quiet ignoring each other while my part is strongest. But I’m noticing her staring at me like she used to, but I’m not giving her the look anymore; but dieing inside. I want her back because I really feel now; life is nothing without her. Can you guy’s advice please? Please? Please?