Do you want to get your ex back? Are feeling desperate and that life is not worth living without your ex in it. In order to get your ex back you will need to take a look at what caused the breakup. If you are responsible for the breakup then it will require you to work a little harder at getting your ex back.
To start with apologize sincerely for what you did that caused the breakup if you caused it. You truly need to mean that you are sorry and that getting your ex back is really what you want. Don't just be trying to get them back just to prove that you can. Try to remember that you are dealing with other peoples emotions and not just yours.