My Old Friend

What I'm about to write actually happened to me.
In 2010 a new girl joined my high school. I was only 16 at the time and I used to go to school with this girl at the high school I previously attended. We never talked then because of how different we were but when she joined my school we became really good friends.
As the months went by I eventually found myself to like this girl very much. Her creativity, her personality, her taste in music and how cute she would look at times even if she were to deny it.
Even whilst I was with a girlfriend during the time I knew her I couldn't stop having feelings for her.
A year eventually passed before i even told her I liked her all this time. She apparently knew it all along as well. I got a little mad at this as I wish she would have just told me so I would move on. But regardless of that I let it go because of the friendship we formed. By the time I had told her that I had actually liked her in the past as this time I had stopped liking her we were both mid-way into year 12 and doing our HSC. I was there for her when she would be stressing and crying about her body of work and tried to help her in anyway possible. This kept going till September 3rd.
On September 3rd this girl stopped talking me entirely. There was no explanation, no reason. She just stopped.
I only know it was this day because it was exactly 1 week before more grandfather's 1 year day of death; the one week I needed my friend more then anything.
On October 12th, 2 days after my grandfather's anniversary, I finally got told that I couldn't be trusted and that this feeling she had towards me had been building up for months. With that and my grandfather and everything going on I couldn't help but cry to myself in the other room. I still to this day don't know what I did wrong and wish I knew how to fix it. I miss the friendship I had once shared with her but at the same time I'm glad this happened. I know now who are my real friends and who I can trust. I know that no matter how nice you can be to a person or whether you have done everything you can to make sure they are ok some people will still be out to hurt you.

To the girl I am talking about... I miss the person you once were and the friendship we used to have. How you would tell me whats going on with my chem and art and stuff and brought me new music to listen to. But after what you did to me. After you abandoned me even when I helped you get through so much. I can't forgive you for that.