Dear *insert name here*,
We haven't met yet, hence the lack of a name, but someday you'll be very important to my best guy friend. First let me say, you're a lucky girl. I have been fortunate enough to have such an amazing guy by my side and you've managed to tie him down.
As you probably already know, he is one of the sweetest guys in the world. Always a text or call away, he was someone I could tell absolutely anything to. He is one of the funniest people I've ever met, luckily understanding my odd and slightly twisted sense of humor. I never have to worry about looking like an idiot or making a fool of myself. I never have to worry about laughing alone about something that probably doesn't make any sense. I have never worried about being myself, no matter how odd, and I know you will feel the same.
However, I must ask a few favors of you. Don't worry too much when he goes quiet, sometimes silence is best. Don't push him to talk when he is content keeping his thoughts to himself. Occasionally your drives will continue with only music breaking the silence, but trust me when I say it's okay to let the quiet continue. I highly recommend leaning back, closing your eyes, and enjoying the breeze from the always open windows.
Don't be afraid to let him know how much you care. Just like everyone at one point or another, there will be insecurities on both sides. Just as I'm sure you'd appreciate them, kind words are always welcome to him. If you're mad don't let him wonder about why or how bad the situation is. Be upfront and honest with how you're feeling or else his mind will drive him crazy.
I promise that you have found one of the good ones. With one of the sweetest, funniest, and most caring guys on the planet by your side, you're one lucky lady. Please cherish and love him because he'll never let you wonder your worth. Enjoy the laughs, the silences, and by far the best hugs you'll ever find. One last thing you should know before I finish this letter: I made a promise to him that I have every intention to keep. I promised him that I would always be there. If you're going to be such a big part of his life you're going to be a part of mine, so I really hope you like bowling!
Sincerely, the girl who loves him nearly as much as you do.
P.S. Let's hope, for your sake, his love of neon pink was just a phase because right now it consumes his wardrobe.