it is called Later On In Life by Caitlin

We used to be such good friends
You did not have to leave me all alone
I cried for such a long long time
I miss you more then anything

Now I am sitting on my bed
Thinking how you were my only friend
I hope you miss me as much as you say in the letters
You did not have to go;Why did you have to go?

Later on in life there was a knock on my door
I opened up and I could hardly breathe
I saw your face and fell to my knees
I cried till my eyes were dry

But then I looked up again;And it wasn't you
I thought it was but it was not true
Yes thats how much I really miss you