A lovely letter!

I want to send a lovely letter to you, but what can I write? The only things I think about are: You are the person who can understand me the most, you are the person who gives me hope when I'm lost, in my heart you are my favourite song, and when I'm with you nothing in my life feels wrong, of my heart you are a romantic fate, and the most important thing is: You are the person who is my soulmate!