Do you still want to get back together with her? Or are you ready to move on? Act accordingly. If you still want to get back together with her, it might be time to figure out how she is feeling about you.
Now is your chance to be a little more direct when it comes to getting your ex girlfriend back. You need to play strategically, however. Do not simply beg her to get back with you, because this is not a good time to be emotional.
Instead, what you should be doing is playing things cool with your ex. If you have spent enough time apart from her, she is probably missing you as badly as you are missing her. Play hard to get a little (don't over do it) and show her that you are doing fine without her. This will inspire her to really rethink things.
And if getting back together with your ex really is meant to be, now is the time when it will become apparent. Be careful not to analyze things too much, because over analyzing may prevent you from acting the right way when trying to figure out "what can I do to get my ex girlfriend back". Just take things slow and play them cool and you should be fine.