Get an ex girflriend back is matter of consistence
If you want to get an ex girlfriend back without hassles, you will have to work consistently toward your goal.
The most important thing to do is learn all what you can about relationships in general because the most you know, the best you could identify your problems and the real causes of your breakup.
There are very good guides out there and you should pick one of the many that suits your need to be much better prepared for your task.
Once you have learned about relationships in general, you should reunite with your ex girlfriend and this time you will be able to build a much solid relationship because you will not make the errors the caused your previous breakup.
This will make your relationship much more healthy.