What you need to do now is to get your ex back from whatever it is that drove her away. You need to change those behaviors, change that environment, because really you do not need another person telling you how bad it was that it led to the love of your life running away.
For instance, your ex left you because you were not taking care of yourself anymore. This normally happens when you are in a long term relationship. You tend to get so comfortable that you do not make the effort to please your partner by presenting yourself well. It can really be a drag that can drive your woman nuts. Well, it did actually, that is why she bolted.
So in this scenario, to get your ex back from that horrible situation, you need to change that and show her what she wants. Remember, when you are trying to get your ex back, it is all about your ex. You cannot do things that you think will please in your terms. What is necessary is to think the way your partner does to attract your partner and give her what she wants.
Obviously you need to do something about the way you look. Improve yourself and show her that whatever drove her away is gone. Now this is easier than it sounds like because the first step is to accept that something was wrong with you and that can be a hard pill to swallow but if you want to get your back from that behavior that drove her away, you must!