You really shouldn't have done it

You're right, it was a mistake. It was the stupidest thing you've ever done.

I hate arguing with you, it just made me angrier and more confused. I experienced a feeling I never thought I'd feel and it just made me even more worried. I don't know why I felt it. I thought I'd care more. But I was just so frustrated.

You really shouldn't have. I hate it when you're hurt. I hate to know you're crying. I hate it. Never do it again. 

I'm sorry, I really am. I'm sorry I made you feel like that. You're the closest person to me and you will be forever. I'm sorry.