The World that Never Was, wasn't a bright, vibrant world but right now the world seem so bleak to Axel. Almost as if the world was completely colourless. Which it was actually but Axel had never noticed, since Roxas had always been there.
Roxas had left and it didn't matter how much Axel had pleaded, Roxas had left anyway.
Axel couldn't help thinking that no matter what he had said Roxas would have left either way. Roxas had always been rather stubborn.
Axel felt like that without Roxas by his side, that he was dying or at least he felt like he was dying.