How can I start this?
Let's begin saying that this is my first gift to you (hoping that you start from here XD)

(1/3)
You are the best thing that could ever happen to me. I'm so grateful to have met you, and I'm more grateful that you are my fiancé.
I love you so much, you are so… wow <3
I really don't know how to describe you except that you are so awesome. My love for you grows more and more over time.
Every time I'm away from you, I miss you so much. And every time I'm with you, you make me smile
I love you, I love you, and I love you.

A little hint to find the second part: "maybe a little bird could tell you where to find it" (and again, this only work if you start from here XD)