After a couple has broken up, there are several things that you are supposed to not do. These breaking up don'ts range from how you could act with your ex or how you treat yourself. Below are a few things you should keep away from doing if possible, particularly if you think you have a chance of getting back with your ex.
Most importantly, do not put yourself down. You will be let down or emotionally distressed after a break up which is understandable, but you have to get over it. You need to try to put your mind at ease so you can think rationally. Trying to think about your situation while not being able to think clearly will most likely lead you to making wrong decisions.
Do not immediately chase after your ex. This will be counter productive if you want to get back with them or not. They will not want to talk to you just yet, the both of you need time to yourselves to pull through an emotional time. You should get over it as soon as possible and go out and enjoy yourself so you don't go crazy thinking about your break up.
Don't talk bad about your ex if you have an interest in getting back with them. If you have bad things to say, you can be sure it will get to them eventually. By the time they hear it, they will have a worse version of the story than when it started making the rounds. Try to say positive things about your ex because if this gets back to them it would shed a good light on you.