How to write a sentence with sincere attitude of admitting mistakes?

1. Because my mistake made you angry, I also felt remorse and regret in my heart. I assure you that this will never happen again. I told you with a short message that I was wrong! I just hope you can smile and forget your troubles, my good brother. Forgive me.

Sorry, I wasn't angry with you yesterday. Are you okay? What are you doing at home? Are you mad at me?

I'm sorry, I got up the courage to say it, and I'll tell you in another way. I wonder if I can get your forgiveness.

I don't know what to do at this time. I can't see your news or hear your voice. So quiet! My heart is broken! Text me back soon.

Maybe my willfulness hurt you carelessly, but I want you to know that I didn't mean to. For you, I will change.