The main priority that would be on your mind after a breakup would involve trying to make it up to the person that just broke up with you. In spite of the fact that this is the case, it is important to note that in most breakups trying to contact your ex is the worst thing that you could ever end up doing at the end of the day. This would make the person feel like they are never going to get rid of you, and you would get rejected all over again which would ruin virtually all of the progress that you might have previously made.
If you want to avoid worsening your breakup, you might want to try giving your ex some space. This will give him or her the time to rationalize the relationship that they were in with you. You might want to continue to be friends with this person as well, and trying too hard to get them back or forcing them to talk to you is going to eliminate the possibility of such a thing happening for pretty much the rest of your life.
A huge number of breakups are caused by a lack of communication, and in some cases they also come about due to overbearing or improper communication techniques. The best thing for you to do would be to learn from the breakup and try to become a better person who would never do the things that you were accused of ever again. Beating a dead horse is something that will never add any kind of value to your life, and it will just make things even worse for you in the long run.