Well.

I didn't mean to hurt you. I have nothing else I can really say. I never meant to make you sad, or make you want to go back in time and change things. I've turned myself into a regret, and no one wants that. How would you feel if someone told you, you were one of their biggest regrets? You would probably feel like shit. Thats how I feel right now. I wish I had felt like that back then. I wish I had had enough sense to think into the future and realize I would hate myself eventually.
You were such a good person. And seeing how sad you are now, I hate to think that i'm even capable of doing that much hurt to someone. From now on, I will make myself the vulnerable one in a relationship. Because if i'm not, then I will hate the power I have and I will crush whoever i'm with. Just like I did to you. I'm sorry. I don't have anything else worth saying. Other than that i know you will never read this, and even if you did, it wouldn't change anything. But somehow, getting it out, makes things a little bit better. I swear. I didn't mean to hurt you. Not ever.