At the time your girl realizes that she's had enough and she wants to move on in order to meet other people, this can be a really hurtful thing. There are many ways for you to get over that hurt and sometimes you can even get back together with your girlfriend if you do the right things.
Learning
how to get her back is not like walk in the park. Nevertheless, there is a system that will simplify the things and make it easier than you might think it could be. There is no promise that it will work for everyone, but you should give it a try if you want to know how to get her back.
At the time the breakup really happens, try not to go chasing her and begging her to return to you. It is not extremely masculine, and it is not going to help you anyways. She has made up her mind, probably she is hurt or angry or both, and if she sees more of you at this time will not be quite a pleasure for her.
Try to give her some space and some time get herself back in order and to heal. While she is having time to reconsider things, you have to do some thoughts by yourself. It is painful to admit that the two of you as you both will not end up together anymore. If she does not wand to change, maybe you should be the one to reconsider your behavior.
Try to analyze your relationship with your girlfriend, and actually understand what the things you did wrong were. If you really know what it was, it is a great thing, because some of the girls will tell you what your problems are at the moment they decide to break up with you.
You have to work your problems out and find the underlying cause of your biggest issues. When you are done with that or almost done with it, you can try to get contact again with your ex. Keep in mind that you need to keep it light and simple, calling about getting back together or the breakup will more often than not received without much positivity.
After you have established contact with her again, you can gradually get back with a few contacts friendly but without getting too much friendly. Doing somewhat familiar and fun should bring loving memories to the outside, and begin to reawaken a little of the feelings she had for you in the past.
From here, you just need to follow the course of the action. Keep your mind on her, pay attention to her, and observe any signals that she might still love you. You need to let her see that the troubles you had that have ended your relationship have been resolved or are in the process of being resolved. You just need to be the man she loved but without the faults that made her leave you.