Let's jump right in.
1. Improve YOU
This is a very important step to winning her back. Let her see that you are substantially better than before, both emotionally and physically. What areas should you focus on? Begin with the areas she complained to you about. You know what they are. Make them better if you can. For example reduce the quantity of time you spend playing video games and watching sports. Get in control of your emotions and be a bit more mature. Begin dressing more dapper and with a much neater appearance. Going to the gym or working out more will wont hurt. A healthier and manly body will absolutely increase your chances.
Have faith. You WILL win her back at best. At worse you would have improved yourself and be ready for another relationship. Surround yourself with optimistic people and with things you LOVE to do. If you want to win her back simply because you enjoy being with her, this will come shining through and increase your chances of getting her back.
3. Give Her Space
This might see counter intuitive since you want her back and want her back NOW. This tip is especially true right after the breakup. Give her time to think and understand how much she misses you and loves you. Don't make matters worse by saying or doing the WRONG thing.
4. Go Out With PLATONIC Female Buddies
Be VERY CAUTIOUS with this step as it could back fire. You are NOT going on dates with new women every night. It should be someone you have been friends with or even mutual friends. The point of this step is to show her that other women enjoy your company and that you are not at home waiting for her to come around. If it works as planned your ex will be running after you in no time. Again be very cautious with this step.
5. First Contact
If the above tips are playing out as planned, eventually you will have to make contact with her. If she agrees great and when you finally do meet, offer a SINCERE heartfelt apology even if the break up wasn't your fault! Put your pride aside for now. If you don't think you can say it, have a written apology handy. Don't spend too much time on this, just say it with sincerity.
6. Have Fun
You will not win her trust overnight, so don't push things. Go back to your basis as friends and slowly build up from there. Even if things are going great, don't rush. Let things progress naturally and show her how much you have changed for the better.
7. Express Your Feelings
As things progress, let her know how you feel. DO NOT expect her to respond the same way, it WILL take her longer to trust you again, especially if you hurt her badly. Begin doing romantic things you enjoyed before to rekindle those feelings. A simple movie, going for a walk, a nice dinner whatever you enjoyed doing as a couple before the break up. Be patient and she will come around and will love you even more than before.
8. A PLAN
So far we have look at the best way to get your ex girlfriend to want you back, HOWEVER do not attempt to get her back without some type of PLAN. You will probably make the USUAL MISTAKES 95% of men make when trying to with their ex back. Wouldn't it be nice to have a step by step approach that shows you EXACTLY WHAT to DO every step along the way? Don't blow the ONLY chance to do it right! Get The PLAN.