Perhaps, you have broken up with your ex but you still love him/her, so how do you know whether you still have any chances to get back together with him/her?
One of the most important points to look out for is obviously whether your ex is still interested in the relationship. If your ex has decided to let go of the relationship and move on, then it will be very hard for you to get him/her back.
If you have just broken up only a few days ago, ...