Why is it so hard to stay in a relationship for a long period of time? There are exceptions such as people who are living happily ever after since they have found somebody to love but in general there are more who are in constant distress because of relationship problems that often end up in separation. Before taking any steps to get your ex back, you have to be willing to face the fact that she is completely over you, and wants to live a life without you due to the way she feels.
Whether you can get back together again will also depend on the rift that drove you away from each other. Are your problems workable? Can you find solutions to them? If she was upset that you didn't seem to care about her or what she wanted out of life, that's something you can try to remedy in yourself, taking more of an interest in her life. It will help if you become more sweet and attentive because women are keen on finding men who have sensitive nature and are not ashamed to show their softer side but are still very masculine and will be able to take care of them whenever and wherever.
If you really want to work things out with your ex, you must be prepared to reassess yourself and make some changes. Since it can be difficult to alter your existing personality traits, you may find it difficult to be the person she wants you to be. There are things you might not want to change about yourself, and in that case you have to decide which is more important, staying who you are or being with her. If you want to be with someone, and you think you've found them, it might be worth it to do whatever you can to maintain and get that relationship back.
Wooing never hurts but do not overdo it. One thing that women really love in men is making large romantic gestures - surprise picnics, rings, flowers, and the like, so concentrate on that. Know what your lady wants and do not fail to deliver on the awe factor because this is where you will get her to become vulnerable.
Sacrifice the things you like to do because you're single, and occasionally give her what she wants, like nice restaurants instead of takeout, or a chick flick instead of an action movie. This might not be as an enjoyable experience for you as it will be for her but it will surely open things up and there will be a better chance of getting her back.
While you have to make concessions, don't just cater to her. While regaining your estranged love can be a wonderful thing for you, you may not enjoy it as much if you submit too much of yourself. Put your best foot forward, give her the attention she deserves (but you didn't give her before) and wait for her reconcile on equitable terms.