Did your girlfriend break up with you and leave you feeling awful? You thought she was the one you would be with eternally and unexpectedly she left you without notice. You assumed all was going great between the two of you, what went wrong?
Occasionally you can be so absorbed in a relationship that you just do not see the little things that can be going wrong. Your girlfriend could have talked to you to make some corrections but for some reason she did not. Now she has left, what can you do to get her back.
Obviously the first thing you need to do is find out exactly where you went wrong. If in fact it was you, you need to face up to and admit your mistakes. Then you will need to do whatever it takes to correct yourself so when you make an attempt to get your ex girlfriend back you will not be repeating the same things again.
Your ex girlfriend would probably think that getting back together would be a repeat of the last time together so you need to be convincing enough to prove you have changed. If she would be willing to try again she needs to be sure of you and your intentions.
If it was your attitude that chased her away would it be too difficult to change enough to please her? Or anything for that matter, would you have the will power to change for the duration of another try at your relationship. If you feel so much love for your ex girlfriend that you would be willing to make the necessary changes, then by all means make an effort to get her back.