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Was it a fight, cheating, or did you feel that he slowly lost interest? Understanding why he broke up with you will help you understand if trying to get him back is the best thing to do.  Think about his behavior in the weeks before the breakup. This will help you determine if the relationship can be saved. If it was a sudden breakup resulting from a disagreement, then he just may need some cooling off time. If the relationship had been going wrong for months, then consider if trying to get him back is worth the effort. If it was an argument that led to the breakup, understanding why the fight happened will help you fix it. Was it your first fight, or was the fighting consistent? People fight, break up, and make up all the time. But if it was a pattern, this indicates bigger problems in the relationship as a whole.  If the fight was physical, understand that physical violence is never okay. It is not a good idea to get back into a relationship with someone who uses physical violence against you. Alternatively, it is never okay to use violence against a partner. Seek help from friends, family, and possibly a doctor if you have or have had thoughts about harming your partner. If the relationship ended due to cheating, think about if a healthy relationship will be possible. More often than not, a relationship that ended due to cheating should stay that way.   If he cheated, consider if you could truly forgive him. You may be reacting emotionally if the breakup was recent. If you cheated, consider if trying to get him back is fair to him. The betrayal of cheating is difficult for most people to get past. There was probably a root cause for the cheating. It is possible that the one who did the cheating was not satisfied in the relationship. If the relationship faded because of a loss in interest, then consider the reason. The timing could have been off, you may have been going through a hard time, or you may not be the right person for him.  He could have lost interest because one of you changed. You may have gone through a temporary change due to difficult circumstances, or you may have changed for the better. Sometimes people grow apart. If the relationship ended because one or both of you changed, then it might be best for both of you to move on. If you think that you did something wrong, you should accept it, and prepare yourself to admit your wrongdoing. Understand that if you caused him pain, he was probably hurt by your actions.  Make sure that you will do your best to not make the mistake again. If he takes you back, then it is important to not repeat your mistakes. Consider if you truly want him to take you back, or if you only want him back because he broke up with you. You may feel the need to prove to yourself that you can get him back if your confidence was hurt when you were broken up with. Alternatively, the breakup might have made you realize how much you care for him. Do not try to get back together with him if you do not have honest intentions. This will only lead to heartbreak for both parties.
Try to understand why the relationship ended. Evaluate the cause of the argument. Consider if you could get past cheating. Understand why he lost interest. Accept the mistake. Understand your intentions.