Having a relationship come crashing down is not something anybody enjoys. You put in all that time and effort to build up something wonderful only for it to all come to a screeching halt. So it is painful enough as it is, but what if you are not ready to let it end? What if you still want to be with that person?
There is no fool proof way of getting an 
The first step in winning your ex back is to acknowledge that the relationship is indeed over. Some people try to deny this and live in their own fantasy world, but that will not help you achieve your goal. Your relationship is over and only when you accept that can you start moving towards getting your ex back.
By accepting that it is over you can look at your relationship with a more objective eye. Look back and try to find where things started to go wrong, try to figure out why your ex decided to throw in the towel and call it quits. If you can figure that out, you can take steps to fix those problems so when you finally see them again, you can provide a changed you.
The next thing to do for getting an ex back is to give it time. We all get impatient when we want something badly but we have to remember that patience is a virtue. You and your ex need time to sort your thoughts and get your emotions in order. If you rush it you will just ruin whatever chance you may have had.
Another thing to keep in mind is to never, ever beg. That is a deal breaker and will spell disaster for your attempt at getting back together. Most people do not like needy, clingy individuals who annoy them, and by begging you are telling your ex that you are that kind of annoying person. This just drives them away, your goal is to entice them back so this is your worst enemy.
Finally, when you feel the time is right and you have changed and fixed whatever problems there may have been, you can initiate contact with your ex again. Start nice and slow and treat it as a brand new relationship. You need to show your ex that you are a new person and somebody they want to be with.
A lot of relationships end because they get in a rut and want something new. If this was the cause for your relationship ending, then you coming back as a changed person might give them the freshness they wanted in the relationship.
Getting an ex back is not easy and most of the time it probably is not even possible, but there is always a chance that it can work and that is what you are aiming for. But even if things do not work out the way you wanted, do not worry too much, there are plenty of other people out there.