Hey. I really like this.
It kind of goes through the stages of losing a friend, and what might go through your head - without getting too technical.
It was pretty simple, but I think that's what I liked about it. Emotion doesn't need to be complex, or made any harder to understand. Especially since it's hard to really get into someone's head/heart anyway.
However, in saying this, I think it would be stronger if your poem title wasn't so long. It's like you give the meaning away in the title, and I no longer have the need to open up and read the poem.
I don't know, I think if it was a smaller title it would let your poem stand by itself, instead of the title.
Good job though. :)