Summarize this article in one sentence.
Don’t gossip about your friend or what caused the argument, and definitely don’t post about it on social media. This will add more drama to the situation, and it could make things much worse than the original fight. Even if you share your feelings with a close friend, word could get back to the friend you’re fighting with. Leaving an argument hanging in the air could cause resentment to grow. You want to give your friend enough time to cool off, but try to resolve the fight as soon as possible. The amount of time this will take is different for everyone. Some friends will make up 5 minutes after an argument, while other friends may need months to recover from hurtful words. If you rush your apology just because you're tired of fighting, your friend will probably be able to tell that you aren't being sincere. You'll know you're ready to apologize when you don't feel angry anymore, or when you care more about getting your friend back then you do about what they said or did that might have hurt your feelings. Your friend might not be ready to apologize. You should say you're sorry because you actually feel bad for hurting your friend. Instead, try going into the conversation without expecting anything from your friend. Even if your friend isn't ready to apologize in return, you should apologize when you're ready. Just ask them to listen and explain what you're sorry for. A face-to-face meeting will help you and your friend reconnect, and it will be easier for your friend to see that your apology is sincere. Call or text your friend and let them know you want to get together in person to talk. Ask your friend if the time and place you have in mind will work for them. If it doesn't, see if you can find something that fits both of your schedules.  Try starting the conversation by saying something like, “I really miss talking to you after class,” or “I feel really bad about the things I said and I'd like to apologize in person.” If your friend isn't ready to talk, try giving them a little more time. You could also send a hand-written apology note with an invitation to get together and talk more in person.

Summary:
Keep your feelings to yourself. Make up within a few days of the argument if you can. Wait until you're ready before you apologize. Don't apologize just because you want your friend to say they're sorry. Plan a time to talk to your friend.