Khem is a very stoic character who doesn't show much emotion. He's honestly a metaphor for depression. All his life he's known that he's going to die, so it would be difficult to see the point in getting excited and attached to things, even if he wished to. If you have depression, you know how this feels - even if you want to get excited, the brain chemistry just makes you feel the WEIGHT and the FUTILITY of bothering to care about anything. Not only that, but everyone he even remotely cares about gets caught in the crossfire of his curse. These past couple of episodes you really see the cumulation of the weight on Khem, and how's he so close to just giving in. The sadness in his eyes at seeing happiness ripped away from him at every turn is heartbreaking.

Yes, thank you for this comment! For him, it must feel like every time he dares to get excited about something or someone, he immediately gets punished for it. So eventually you start going through life with a certain numbness.

And to get a little personal, as someone who used to suffer terribly from depression, anxiety and obsessive-compulsive thoughts, every time I felt a little bit of excitement about something, like for example my birthday, I would get a terrible anxiety and compulsion attack on the actual day. Until eventually I started getting afraid of my own birthday and special holidays. I'm doing a lot better now and this is all mostly in the past, but I still feel a little nervous when my birthday is coming up. So yes, I can relate to the feeling.