1) Give your woman some space. Give her time to miss you. She can't remember you fondly and miss you if you are constantly in her face. This can be very difficult to do but it's one of the most important things to remember if you want her back.
2) Go out with your friends. Try to have fun. It will be hard, but it's very important not only for your mental health but also so that your ex will start to see you, again, as a fun loving person. The way she saw you when you first got together.
3) Be honest about whether or not the relationship is worth saving. Not all relationships should be saved. Also be willing to honestly admit whatever part you had in the relationship falling apart and be willing to make some changes to your behavior.
Follow the steps I've listed above and you'll be much more likely to get a woman back.