If you have done something to cause your boyfriend to breakup with you, you are probably looking for a way to get him to forgive you. How difficult the job will be depends on how bad a mistake you made because some things are more easily forgotten than others. Doing something that hurts another person sometimes causes more problems than necessary. To get your ex boyfriend to forgive you it will require you to look at what happened from his point of view.
Mistakes are a part of life, but that doesn't make it any easier for the one who is hurt. The fact that you want your ex boyfriend to forgive you means that you may have done something more severe than just saying something to hurt his feelings. If a simple ill chosen word is the cause, he will just need a little time to get over his anger. However if you have cheated on him it will be a matter of regaining his trust and respect which you should realize won't be easy.
Saying you are sorry and will never make the mistake again, won't bring him back into your life and make everything fine. You will have to make the right moves and say the right thing at the right time. The first thing will be to give your ex boyfriend all of the space and time he needs to think. Going into a panic and trying to rush things will only push him farther away. It won't be easy, but the smartest thing you can do is to make your ex be the first to make contact.
If you can't overcome your desire to let him know that you are sorry, send a text and apologize and then do not contact him again. Give him time to think about the apology because any further explanations will just keep his wounded heart from healing. Time is a great healer and by respecting his rights, you will cause him to start remembering your good traits. If he is still in love with you, he won't want to end things for good, but he will want to be sure that you have learned your lesson.
During the time that he is getting over his pain and anger, you need to work on what caused him to become so upset that he broke up with you. You can't just tell your ex boyfriend that you have changed, you have to show him. This doesn't mean that yo should call him and say that you want to show him he will learn about it on his own. Start right now and have the determination to make these changes, no matter how difficult it might be.
This means that if you have a short fuse and constantly throw temper tantrums, you have to learn how to control your emotions. If your problem is telling lies, you will have to become more trustworthy and face up to it when you make a mistake instead of trying to cover it up with an untruth. If you have been cheating, you have to end the relationship at once because you can't expect to have your cake and eat it too.
By making these changes and showing some patience, you may get your ex boyfriend back because he loves you enough to forgive you. However, if you fall back into your old habits, you may lose the man you love for good.