The simple answer to this question is this: DON’T. It is an unspoken rule for people not to get back with their ex. However, if you really want to try it out because you believe that love is lovelier the second time around, then there is no specific way for you to get your ex back. Some people would probably tell you to communicate with him or her again and change whatever it is you think destroyed your relationship in the first place. If you’re a man, some of your friends would probably tell you to give your ex-girlfriend flowers or chocolates and if you’re a woman, your friends will probably tell you to change your appearance so you can become more presentable in front of your ex-boyfriend.
Again, there is no specific way for you to get your ex back and just because you followed this advice does not guarantee that you can get him or her back. You can still try because who knows, it might just be worth it, right?