God does not show you ways to get back to her my dear, it is your heart that keeps running after her and you LOOK for signs, signs that sometimes may not even be there.
For 3 years YOU loved her but she saw you only as a good reliable friend.
If you love her, let her go, do not follow her, do not stalk her, and if you ever run into her just smile and go on your way. You do not own her, you do not possess her. If she loves you she will come on her own but you cannot force her to love you.
If she chooses to love someone else then be happy for her. Be there for her; give her your blessings because if love is true you will always only want their happiness and not think of your own selfish agenda.
Another song that I think you should listen to is http://www.youtube.com/watch?v=2pwT2wiZsg0 (White Flag by Dido.)
Don't go far away from her, no one is asking you to do that, but do not be a leech either. My dear on hubpages you will find a million of us who have endured what you are going through. We use all our feelings to write and you should do the same.
Meanwhile start looking at other women, start searching for another because until you don't fall in love with someone else, you will continue to love her.
I want to dedicate a song to you, http://www.youtube.com/watch?v=pvraIcwco-s
The songs name is 'Blower's daughter', read the lyrics of the song. In it you will find the message I am trying to explain to you.
I hope this helps and if it doesn't remember; you can not force another to ever love you and even if they do love you maybe they just do not want to be with you. Life is complicated and fun.
Use your sadness to empower your being instead of drowning in your sorrow. Good luck.