I am so, so sorry.
They always tell you that throughout high school, you lose friends. You rarely go in with the same people you go out with, but for some reason, I thought we'd be able to survive that. We somehow just fell apart, but I take the blame because I barely noticed until we had stopped talking completely.
I got too busy, and then I shut you out. It was not on purpose. Never did I mean to hurt you. Never did I mean to stop paying attention, but my priorities weren't in the right place and you didn't deserve that. Friends don't leave other friends behind, and for that I am truly sorry.
We used to be inseparable. My Timehop is constantly filled with inside jokes no one remembers, and pictures of us; and all of the things we did together come back to me. I get waves of nostalgia now and then, and I realize that you were one of the best friends I ever had, and will ever have. And it breaks my heart, because so much has changed, and these are all things I imagined we'd be doing together.
I know we'll run into each other again some day, and it will be awkward but know this: I am always rooting for you from the sidelines. I check up on your Facebook from time to time, and I see you're doing great things with your life. You are becoming the star I always knew you would be!
I might not be involved in your life, but I am always there if you need me. I'm always there if you need that shoulder to cry on, and that friend that knows you almost as well as you know yourself. I'd like to thank you. For being such a good friend in high school. For being supportive, and caring and loving. For being the kind of friend I didn't deserve at the time.
Thank you, so much.