If you would like to apologize to your friend for your behavior, here is a simple template you can use to write a letter to a friend apologizing for your rude behavior. You can also send this over text or email.
There were so many things that happened since we last saw each other. In fact, we had a big quarrel. During our last argument, I let my emotions get the best of me. As a result, I said some things I shouldn’t have said. I can’t blame you if you avoided me after that. Looking back at what happened, I regret saying all those things.
I admit I was wrong when I said all those terrible things to you. That was clearly not me. I was obviously not thinking correctly when I was angry that time. If only I could go to a time machine and undo things that happened, I would definitely erase what transpired between us.
I apologize for what happened and I will do anything to make up for it. I can’t imagine spending the rest of my life with someone else other than you. Hoping you would answer this letter as soon as you get it. I really miss you.