That is the most difficult part of any existing relationship. My advise (although it might not be the best one):
Try to move on. See different women. Try to get a varied taste of life from different perspectives. Go for women of different countries if you must. If you find yourself not progressing in forgetting that 'loving feeling' that doesn't exist anymore, try once more. I believe that once it's over, by her choice, I should not to persist in that manner. I respect her choice. She had a good reason to do it. But the feeling is still there. The best thing you could do is try to be her friend and work from there. Do not be disappointed if you end up being only her friend in the end. Again it's a matter of respect. Respect her choice. I'm going through what you are and but I'm not directly trying to get her back. Sometimes, it's best to let things settle down a little and be there for her. You will realize that you either fall into that friends category or she realizes that you are a really good guy. If she is trying to avoid you, try this. Just say that you want to meet her and try to clarify somethings. And tell her that you respect her choice. Not only do you stop pressuring her for her return, you also present an opportunity for you to be around her as she gets her space from all this serious stuff. And, if you do meet up with her, don't act disappointed or desperate. Be happy for her and try to keep an upbeat attitute. A little sunshine goes a long way in showing that you are not as troubled as you once were. It will convince her. Avoid old negative subject such as... "i did this because... that because..." I did that. Mistakes are mistakes. Let them be. Don't let the past cloud up your present. I fell into the same ditch as you. And right now, I progress very slowly. But know one thing, I have very little expectations. All the negs. stay in the past. My fun side is here and positives r present. I subtly tell her that I still have some feelings for her (through my attitude and the way I express myself to her). It's my way of saying that I still like her. But, I don't pressure and I respect her choice. If she wants to come back, she will. Don't expect it because you'll be disappointed if she doesn't. Foremost, if she was special enough to find a place in your heart, you shouldn't snub her out of your life because she doesn't want to have a relationship in that respect. Sometimes, it's good to have a friend that you know is special and understands you.