Simply replace the unfilled areas such as "" and "[date]" with your information.
Dear [name of love interest]
A poet once counted all the ways he could love. But I could never count the ways I love you. They are numbered like the grains of sand in the world, or the droplets of water in the ocean. They are as vast as the measurements of space, and as infinite as the ticking of time. Should I begin in listing the ways I love you, I should embark on a life-inclusive journey of metaphors and comparisons, and in the end, none of them would fully encompass the love I have for you.
So I shall be condoled with the common adage that less is more. And if this is true, then hold this statement as a reference to all my love for you:
I love you, only you, ever you.