I caused a hs girl mental issues
Why did you push her that far?
I was very angry with her and I said a lot of mean things to her.
Mental abuse can last the rest of a person's life. Knowing that you caused the issue with her because of your anger doesn't justify the actions. Seek her out and apologize.
I thought she would leave me alone, I didn't know I could cause her that much damage.
All the more reason to try to apologize. You should never go so hard at someone that you cause them to have mental issues.