Many break ups can be easily brought to an end or even prevented from happening.
If the reason for the break up was over an argument that caused your boyfriend to leave, you may be asking how can I get my boyfriend back after an argument? If it was indeed over an argument, then for the most part these are started by some misunderstanding or because of differing opinions; these should never be the cause for a couple to break up.
Once the two of you have calmed down enough to talk again, you need to work out a strategy together to use if you see a disagreement coming again.
Do your best to prevent a problem before it begins.
If the two of you have broken up and are not talking at the moment, it would be best to let your boyfriend have his space and you do the same for yourself.
Think about what has happened and how to prevent it from happening again in the future.
If you think you may have caused this break up from your actions, it would be good to call and just say you have realized that you brought this on and apologize.
This will take some of the pressure off of your boyfriend and he should loosen up some to contact you again.
Once you and your boyfriend are back on speaking terms again, it would be smart if neither of you brought up the subject that caused the argument that made him leave, just move on to better things and all will be well.