The main reason why your girlfriend left is "Lack of appreciation". No matter whatever reason she gives or whatever reason it seems on the surface, all those things have one primary cause. That is lack of appreciation. But does that mean calling back your ex girlfriend now and lavishly appreciating her. Do that and you can FORGET your dream of getting back with your ex girlfriend. So, how to get ex girlfriend back?

The first thing you should do is, analyze whether she is really worth your love. Do you really love her or is it just jealousy. Give yourself some time to get over the pain of break up and think rationally about getting your ex gf back. If she passes your test of true love and if your rational mind says that she worthy to get back, then proceed to next step.

Start sorting down all the small things which led to the failure of your relationship. Think of all those arguments you had with her. How did they start? Who was the reason for it, what was the specific reason. Similarly, sort down all possible negative and positive aspects of your relationship. Now start working on improving yourself on the negatives of your relationship. But, remember you should only improve. Read some great books on relationships and decide whether you should improve yourself on that subject. Being everything she wants will only show you weak.

Don't be a wussy. Be the MAN. Never call her back. Don't be desperate to call her back. To divert your mind from her, start doing some exercises, hang out with friends and completely avoid her. Give some time to settle your emotions. When you are out of your desperate state and have reached a state of "I can live happy with or without her but I still love her and it would be better with her"

Call her and ask for some coffee. Start speaking like good friend. Speak about all things in world except the relationship between you two. Take thing lightly. Know their response and then give your words. Until you have built a good relationship again, never ever talk about getting her back.

So to summarize, get out of break up pain, never contact her, analyze whether you really want her, then start improving yourself, give some time (ideally few weeks), lose your panic and desperateness and then again become friend with her, show her the value of yourself in action, don't ask out at the beginning itself, build your reputation and friendship, then subtly ask her. 90% of the time you will get your ex girlfriend back. But if you did not get her back after following all the steps above, look at yourself now you are new person no more desperate to get anyone back into your life, can be happy from inside yourself. There are lot more girls out there, waiting for you.