While the letter above is a strong foundation, the most powerful letters—the ones that truly make her cry—are the ones that include specific, "only-between-us" details. Consider adding:

You are my today, my tomorrow, and every forever I can imagine. I love you more than words will ever be able to capture. Forever yours, [Your Name] Tips for Making It Personal

: Specifically thank her for a time she supported you through a difficult situation.

I know we aren't perfect, and I know life can be messy. But even in our misunderstandings, I want you to know that I will never give up on us. I will choose you every single day, over and over again, without a pause or a doubt. I will be your strength when you feel weak and your loudest cheerleader when you succeed.

I’m sitting here trying to find the words that are big enough to hold everything I feel for you, but I’ve realized that language is sometimes too small for a love this deep. I want you to know, truly and deeply, that you are the most beautiful thing that has ever happened to me.