Martin Blackwood spent so much of his life feeling isolated from other people and completely unloved and it made him fall into the cold embrace of the Lonely completely and utterly, to the point he is an Avatar of it by series end. He isolated himself during season 4 for the greater good of his friend and the person he loved, assuming it would affect none of them because he was so unworthy to be cared for and loved.
And how beautiful it is that Melanie King, without hesitation, says they cared for him. That they loved him. That they grieved his loss. That there was still debate and hope he and John had survived because then they would not have lost someone so close to them.
He will never know just how loved he is and how much he is missed















