"Hey Sam,
You have no idea, how hard it is to write this letter.
I don't want to leave you, but I have some unfinished business to attend to. I may not come back after this is all over, I might not even make it through this battle. I just wanted you to know how I feel about you.
I still remember the day we met like it was yesterday, you and your brother were travelling to Wisconsin. You stopped off at the nearest gas station, where you met me. I was a local in the town you were heading to, so you asked me a few questions. Little did we both know, that was the moment that this journey first started.
Honestly, I didn't want it to happen like this. I wanted to be able to say these words to your face, but I am afraid.
Sam Winchester, I love you.
I hate that I am leaving you with these words and that I most likely will never hear you say them back.
Goodbye."