Here are a few tips that usually work well to get an ex girlfriend to come back:
1. You have to be able to let her go in the sense that you are not consumed with thinking about HER.
It's going to be tough for you to get in the right frame of mind to win her back if she is all that you think about. The more attention that you give her, the more times you get lost in a series of thoughts about her, the more you are going to feel almost obsessed with your ex girlfriend. When you feel that way, you start to give off a vibe about you, one that she can pick up on, that is going to end up being a turn off. Practice some thought control and don't allow yourself to get too caught up in thinking about her.
2. Once you are in a better frame of mind, you have to train yourself to see her differently.
If you always think about her as being still *your* girlfriend even though you have broken up, you are setting yourself up for failure and disappointment. You have to accept the fact that right now, this is not the way that it is. And when you approach her to try and win her back, your mind has to see her as a new woman. Get to know her in a different way, so that you think about her a little differently and she does the same. If you just go back to the old way of things, well, that's what led to the break up.
3. You have to know how to play around with her psychology as a woman in a GOOD way.
Knowing a little thing or two about female psychology in the context of dating and relationships is a good thing and it is something that most men are clueless on. See, when you know a little bit about what makes her tick and what really drives her to feel a lot of attraction, you can use that to help you to make her feel that way about you. And that is when the situation will be just right for you to win her back.