Dear Jack,
I wanted to write this to you in a letter because I'm too scared to tell you in person. I know you cry easily and I don't want to see you cry. I'm so sorry Jack, but I'm moving.
We have been my best friend since kindergarten, and I'm so scared to leave you, but I have to. We have been friends for four years and I don't want to lose that. I'm going to miss you so much Jack, I can't even begin to explain how sad i'm gonna be. Even though i'm moving we can still stay in touch. We can write letters and maybe sometimes you can come visit me in my new house, I mean, we'll only be one city apart.
Maybe, before I leave we can hang out? I'll understand if you're mad at me and never want to speak to me again, but Jack, there's something else you need to know.
I like you Jack, I like you a lot. I don't know whether you feel the same way about me, but I know I feel this way about you. I've liked you ever since I first saw you.
By Jack, thank you for being the best imaginary friend ever.
Love, Sarah