If you have broken up and want to get her love back, you are going to have to use some intelligence to fix the problem.
Never resort to emotional blackmail in these types of situations, because you certainly don't want to drive her even further away from you.
Don't be pathetic, or keep calling her constantly, and remember that acting jealous will not get her love back.
Acting desperate will only serve to annoy her, and if she becomes annoyed with you, she is likely to end things with you forever.
Instead, let her start to miss you, and let absence make her heart grow fonder.
As soon as you let her realize how much she really misses you, she will probably start to try to find a way to get you back into her life.
Although this might sound too simple to work, it's the best course of action if you want to get her love back.
Although many people do try to use jealousy, these attempts generally fail.
Although there might be some women who would be influenced by jealousy, it generally backfires eventually, because of the fact that you'll lose her trust.
After all, if you try dating somebody else to make her jealous, she'll remember this, and will probably be suspicious of you in the future, even when you ARE being faithful.
The best method is to take it slow and easy, don't rush things, and make her start to miss you on her own.
This way, she'll come back to you for the right reasons, and you'll get her love back for good.
If you think that your relationship is worth of saving...
you should fight for it.
Don't give up...
your situation is not hopeless! You can still reverse a break up and successfully reunite with her.