If you decide you want to bring your boyfriend back after the two of had broken up, you had better analyze what led to you guys breaking up in the first place. If there are some underlying problems you just are not aware of, you had best discover and fix them before trying to get together with your ex.
After the break up you should think about yourself and get over any emotional pain you may have. The quicker you can get past this can you decide if it would be worth getting back together with your boyfriend. If you think you were the cause of the break up, then it would be in your best interest to apologize then give your ex some space to think it over.
During this time do not contact your ex for a while, use this time to take care of yourself by going out with friends and enjoying yourself. You need to work on your emotional health so you can move on with your life with your ex boyfriend or without. While not contacting your ex, this will make him think about what you are up to and his curiosity will be getting the best of him.
When the two of start to talk again, it would be best not to bring up the break up. Avoid opening up any emotional wounds and starting an argument. This would most likely end any chance of the two of you re-uniting. If you must bring it up, try by asking what you can do to make things better so it does not happen again.