Wow, very powerful. Great flow and rhyme scheme. Is this about who I think it is? If it is, I am sorry (I just found out today), and I wish there was something I could do so you would not feel betrayed. If I am wrong about who this is about then I am sorry I wasted your time, and boy do I feel like an a-hole.
I really felt what you were saying. When i can connect with a poem, and what feeling and effect the writer is trying to convey then you sure as hell get a thumbs up from me :] We all know friends are quite capable of walking out of our lives, i think its one of the hardest things to accept.