If you truly want to get back together with your ex girlfriend, you will need to look deep inside of yourself. You're going to need to be brutally honest. Perhaps the most difficult thing of all will be deciding if getting back together with your ex girlfriend is what you need to be truly satisfied with your life. If you're really weren't happy together in the first place before the break up there is a good chance that you will just wind up breaking up again and suffering as you are now.
After a difficult break up it is all too common for the one who was dumped to think only of the really good times together and push all the bad into a dark corner. If you want to know if you and your ex girlfriend can get back together you will have to shed some light on that dark corner. All of those bad times and let downs need to be examined. If they were all problems that can be overcome then your relationship is worth saving. If there are some problems that you are totally unwilling to think about or confront than you should stop now because until you overcome those issues you will never be happy together as a couple.
Nearly every relationship is worth saving. Even if you spent a great deal of time fighting each other, there is a chance that there was simply a deeper problem that once solved will mean that you and your ex girlfriend can get back together.
Here are some problems, however that are a good indication that you shouldn't even try to save your relationship. If your ex girlfriend was abusive, then that relationship was definitely not a healthy one and you would do well to move on to another woman. Also if your ex girlfriend was a manic depressive or generally unhinged than what she probably needs is a doctor not a boyfriend. Crazy people tend to make the people around them crazy. If you value your mental health you would do best to let the break up stand.
Persistence pays off, but not when it's annoying to your ex girlfriend. Making yourself appear desperate by constantly trying to contact them is about the worst thing you can do. If you and your ex girlfriend can get back together it will be because you were able to exhibit a great deal of self control. Constant text messages, emails and phone calls are not going to help your case. Commenting on everything she does on Facebook will do little more than show her friends that you're annoying and cause them to support her decision to break up with you.
Furthermore, arguing with your ex girlfriend about her reasons for breaking up with you is a dead end. Unless there was a simple misunderstanding, like she caught you having dinner with your cousin and thought you were cheating, you're better off treating her like an adult who knows when something isn't good for her.
If you're constantly beating yourself up for the things you've done, or think you've done, wrong then you need to be able to set that aside. If you're going to get her back you need to understand the reasons why she left you, and show her how you're different now. Begging her to forgive you and constantly apologizing isn't going to do you an ounce of good. The time to apologize is after you've shown her that you're the greatest guy she's ever known.
So, if you really want to know if there's a chance that you and your ex girlfriend can get back together then you also need to ask yourself if you can stay in control of your emotions. If you're totally out of control and resort to stalking her until you get her cornered then beg and plead for forgiveness, forget it, she's lost. However, if you are capable of keeping your cool long enough to let her see that you really are a great guy then you've got a real solid chance of mending your relationship.