You're lovely and you're loved. I think you're breathtaking, and I sometimes envy the beauty you don't see. You're delightful, the way you speak and walk and read. You're downright enthralling, and I wonder why you chose me, of all people, to read your story. You're so ******* yourself, and I can't find the words to say how wonderful you really are.
I wrote this with my best friend in mind. But I guess it could apply to a significant other.