He visibly flinches at the comment. He can't know what Foster's thinking. He doesn't know about memories his lost and now had returned. The only thing he has to go by are Foster's gestures and his words. Seeing the human turn away, he assumes he's mad. Foster's words only reinforce that judgement. Still it's not the anger that bites at him, it's the apathy.

The bored tone Foster used to comment on his life and lack of death, it said more to the Psionic than the meaning of the words themselves. He's more than intimately acquainted with the desire for things to stop, for someone else to end it because you're too unsure or too scared. He can only guess that's the reason Foster's still here.

The human in front of him was confusing. He did and said things that the Psionic didn't understand. Maybe Foster's feelings were completely different than what the Psionic assumed. He knew that could be a possibility, but how could he view Foster's situation through a lense other than his own? So he makes his assumptions, and those assumptions mean that he has been acting like a total piece of shit.

"I'm sorry I said that to you. I didn't... I thought you were just trying to look sympathetic."