You have to ask yourself, Is it worth it to get back with your ex girlfriend? This is an important questions to answer. When you loose a girl you may end up finding a better girl that can make you happy. So you have to think about if your getting your ex girlfriend back is going to make your life better.
Once you figure that out you can devise a plan to either meet a new girl or get your ex girlfriend back. Think to your self whether or not your ex girlfriend feels the same way about you? If you think the two of you will be happy together then the ex back program will help you get her back.