Hmm . . . I might be overcomplicating things, but:
It's almost like, at the end of the poem, you've fallen out with him, lost touch or something happened to him. I just found myself thinking of the phrase ' you don't know what you had until it's gone '. That sounds extremely dark! It might be as simple as you didn't know you were his friend until he said you were! It's just that I've fallen out with do many people that I deemed friends that this sort of rang true. That's the beauty of poetry - it's all down to your interpretation.
I liked the rhymes and the title. The latter brings me back to the idea that you aren't really sure that he is your friend anymore, as it's questioning. Or maybe that's because you asked him to be your friend.
Because I always have to see poems in a dark way, I think I'm going to invision it . . . Darkly. Haha
Anyway, nice write :)