Dear _________,
You are my sweetest and truest friend. We’ve known each other since grade school, and somehow we instinctually know what the other is thinking or about to say! Over the years, our friendship has continued to thrive even though we are miles and states apart. You are always kind and thoughtful, remembering birthdays and anniversaries, and sending the sweetest cards to mark every holiday. And although this may seem a bit out of the blue, I just want you to know how much I love and appreciate you, and that I think of you often.
Many kisses,
(YOUR NAME HERE)