Before a temporary separation, this goodbye letter can inspire correspondence between loved ones.
Dear {Recipient},
I love you, I love you, I love you. So even though you'll be reading this letter after we've said goodbye for {length of time}, you should know it's not really "goodbye" at all. We will be together again one day soon, and this period of time won't even be a blip on our radar.
So let's just try to focus on all the good times, both in the past and in our future. You will be hard at work {going to school, at a new job, etc.} and I'll be here {doing what's keeping you there}. But it's best in the long run, and we know that.
I love you. Have I mentioned that? Good, because it's true. And it's what you need to remember most of all. Distance can allow doubts to creep in, but please know that I will never, ever stop loving you. No amount of miles between us can change that.
I'll end it here, and I'll talk to you soon and remind you of everything I've written, plus a hundred more reasons why I believe in us and know we will make it through this. Until then, just remember, again, that I love you, and I always will.
Yours,
{Sender}