Stop chasing her! You need to sit down and regroup. Gather your own strength. Look around. Is there something you neglected to do because you are so consumed with getting her back? Is there other important people you neglect because of it? Take a deep breath and focus on YOU.
Drop the cell phone! Stop calling her texting her all the time. This only reinforces negative behavior and gives her more reason to break it off with you. If you want her back, you will have to be collective, calm and confident. You can’t be those emotions and frantic at the same time.
Take a long walk. Ask yourself on the walk, Whats great about this situation? What can I learn from it? What can I do to be a better person? Really think about it. Look for positives. Once you learn the lesson, you no longer have a need for the pain.