Have you separated from a close friend, girlfriend or boyfriend due to something you did and now would like to fix it? This person was close to you, and you understand that your actions were incorrect and it ought to never have happened. You would like to know how to re-establish a broken friendship and get your friend back.
At the top of the list of things to do is accept the blame for what happened if you are at fault and apologize to your friend in person. This is not the time to call or send an email or text message. This is very important for it shows maturity on your behalf and will take some of the anger out of your friends emotions.
If you have a close mutual friend it may benefit you to talk to them. They may be able to be a referee so to speak and help smooth out the trouble. They may be able to break the ice between you so you can start communicating together to regaining your friendship.
If your friend accepts your apology they still may need some time to get over it. Give them some space till their emotions calm down, it may take days or weeks. You may have to rebuild your friendship and if your were at fault you may have to prove yourself a trustworthy friend.
Once you are talking again you may want to discuss what each other has been up to since last seeing each other. This will give you a chance to find out what the other persons expectations may be and more about their feelings. Anything to get you past bad times can be useful.