Potter,
You will not receive this letter, but only because it wouldn't be fair to Lily. I wish you did, though, because, I want you to know how much I hate you. You stole Lily from my life. You stole her love from me. I hated you, Potter, and, until a few years ago, I thought Lily hated you, too. But then I saw the way she looked at you, even when you didn't. I watched as she slowly fell in love with you. She chose you, so, she must have chosen right. For, I have seen her eyes, her beautiful eyes, light up with love for you. So, I can't really hate you for that.
I could have loved her more than you, but I could never have made her happy. I could have died for her, but I couldn't have lived a better life for her. I am down a very dark and narrow path. And so, despite all my hatred for you, I realise that you are the only one meant for Lily. The only one who could make her happy and keep her smiling. And that is the one redeeming quality in you. It certainly lessens my hatred for you, but only a little.
And slowly I understand that you never stole Lily from me. She was never something to be stolen. You earned her love. I could have done that. I could have chosen a better path. I could have changed.
But you changed first. You proved yourself worthy. And she learned to trust you and grew to love you. All I can do now, is hope that you keep her happy.
And despite my all jealousy, I know you will.
Snape.