This part is so heartbreaking for me because for the first time we see how lonely Keith really is. He was orphaned early in his life and has lived alone for so long, so he doesn’t have any of the attachments the others do. He had no parents to love him and he was kicked out of the Garrison so suddenly. Even then he was a loner, and he still is the lone wolf of Voltron. His lion chose him because he is distant and hot tempered. I have a feeling that he is full of so much anger because he had no one to make him feel happy in his life. Even when he was at the Garrison he kept to himself, alone at the top, not even having Lance as a friend because of their supposed “rivalry”.
Aside from Shiro, Hunk, Lance, Pidge, Red, Allura, and Coran, he has no one that he cares for. Team Voltron is his whole world. Even when they were doing that mind exercise, the only thing occupying his thoughts were memories of being alone in his sad little shack. Isolation is the only thing he knows. He says that everyone in the universe has a family. And everyone does. Everyone except for him. He has nobody that loves him.
So when Hunk and Pidge were so eager to leave in favor of going back to their families he couldn’t understand it. He thought it was selfish to abandon their mission just to go back to someone you loved, but he had no idea how it felt to have people to return to. So I just find this scene so sad because Keith is all alone and now the only people he’s ever truly cared for are thinking about leaving him all over again.
And the worst part of it is that we all know he’s going to be revealed to be half Galra in season two. So that pretty much means that the tiny piece of family that he does have will be the enemy, the very aliens they have been trying to defeat this entire time. It will break him, because he can’t even enjoy finally having some family since they are trying to kill the only people he has ever cared about. I just have so many feelings about Keith Kogane.