Figuring out how your ex feels about you after the separation, so that you find out whether or not there's even a chance to get her back, can be one of the toughest obstacles standing between you and successfully reconciling with her. Until you know for sure if your efforts will be warranted, it can be hard to muster the courage to try win her back...but here's a way you can find out!
It all makes sense if you think of the human heart as a kind of "emotional scale" where people in your life range from Indifference to Intense Emotions (like love and hate). You can use this visualization to see through your ex girlfriend's actions and figure out just how she still feels about you: whether she doesn't really care anymore, or if there's still a little spark of passion in her heart for you.
To see where you are on her scale, all you have to do is watch how she treats the idea of communication between you. If she's slow to respond to your calls or never does at all, and never tries to initiate contact herself, then I'm afraid you're probably nearer the Indifference end of the scale than the passionate end.
However, if you find her more than willing to talk to you, and usually in a positive manner...the outlook is much brighter! If she responds to most of your calls (or all of them!) and makes at least a little bit of effort to keep you in her life by contacting you herself, it's a clear-cut clue that you're still on her mind a lot...and in her heart as well! The flames may have dimmed down, but they haven't been extinguished and there's still an opportunity to set them ablaze once more if you give them the right fuel!