Okay so i totally understand that you were (at one time) in "love" with the girl. We all have done it and even the best PUA find something special sometimes. However, here is flip side.
Although she WAS great and everything WAS awesome, they went bad. Some people aren't meant to be together and sometimes people just need to be okay with that and move on. I had a three year relationship with a girl I loved to death. We broke it off and I was a little bitch about it and said how I would change etc. Now I look back and I am DISGUSTED with how I acted.
Point being, if it ends....let it go. Millions of people out there.