Loved the repetitive feel to this, but to me it reads much like a story. Each stanza flows well with the other connecting well. Of course I think if you added any other emotion in, it wouldn't have worked because that would have thrown off the flow. Sadness really is a fickle thing. The emotions here are very real and not a lot of people understand that at all. "Has anyone told you". No it seems like they haven't. But it builds up more and more until the pain overflows and then to everyone's surprise you are just gone. Then they say they had no idea. Very depressing. Excellent write