Sometimes it happens that you find it hard to forget someone you once loved, like a former girlfriend that you always think about.
If you feel that you are unable to move on because of these feelings you still have for your ex then trying to resist it will be futile, instead you should look into ways of winning her back into your life.
First thing that you should do is show confidence.
Show your ex that she is missing something really special in her life.
Dress to impress, pick out clothes that looks good on you.
Wear a nice smelling cologne, make sure your hair is well-kept and try to  exude a strong sense of style and make sure you know what you want.
  Another thing that you should remember is that all of this takes patience, lots of it.
Despite your transformation into a dashing young man, you should not go after her and come off as desperate.
Instead you should act as though all things are normal and your actions should reflect who you were before the break-up.
  At this time, you should work on being attractive and irresistible to your ex-girlfriend.
It will be easier for you when she notices that others find you attractive as well.
The important thing you should keep in mind is to let her come back to you at her own will.
  But in the process of getting your ex back you should not sacrifice who you are.
Do not be someone you think she would love.
Do not change any aspect of yourself just so she would come running back to you.
She should love you for what and who you are.
But this does not mean you should not strive hard to better yourself, you should but not to the point of pretending to be who you are not.
  One more thing that you should work on at this time is to be her friend.
If she still wants both of you to be friends, do not push her away or shun her just because it's not what you want.
It is an opening that you should be optimistic about.
Be her friend, earn her trust and let her get to know how fabulous you are as a person and when the right time comes, you can make your move to win her back.
However, if you feel that it seems hopeless and she does not want to get back with you, be a sport and accept it.
It may be that you are just not meant for each other.
Do not be in despair, instead continue working on to better yourself and one day soon you will meet the right girl for you.