You must be honest with yourself, do some soul searching, then you will have the power to decide if you can go back to an ex. It is time to face the facts and decide, will you be truly happy if you and your ex get back together, will you end up going down the same road again, and break up yet again.
When you first break up it is usually easier to think of the good times. It is very important to think of both the good times and the bad times, be completely objective and REMEMBER both. There are very few relationships that are not worth saving. Did you and your ex have more good times than bad times. BE HONEST! Did you spend more time having fun, doing positive things. If most of the time was not happy and you both were fighting, then you should consider moving on.
Was there any physical or mental abuse, if so this is not a healthy relationship, do not go back to someone who has no respect for you. You are worthy of so much more. If your ex was mentally unstable you are better off with out them.
The tips listed should help you get your ex back. Once there was no mental or physical abuse, and over all it was a healthy relationship.
Pestering and pushing constantly is a bad idea if you want your ex back. Trying to keep in touch by stalking, sending text messages, emails and "bumping into them will do a lot more harm than good. Basically this is a sign of desperation and will only drive them further away.
Are you living in the past. Being alone you might manifest thoughts of wrongs you might have done in the past. Are you beating your self up over mistakes you might have made? The past is exactly that, THE PAST, HISTORY. Leave all these in the past, start living in the present.
Start living in the present and concentrate on what you can do now, not what you should have done. Making promises that you will change and that you cannot keep will not help. This will not make you and your ex get back together.
Give your self a break from worrying what your ex is doing. By letting you both have time apart, you will actually be giving your self a big favor. By letting your ex miss you, you will become more attractive and desirable to them.