I really wonder about the logic of. Hey she smiled, that means she actually doesn't care about her grandmother dying.
Just because you lost a relative, doesn't mean you are supposed to sulk 24/7 every day of the week for months okay. You can have hours without a hint of sadness and suddenly it hits you. It's not like you are stuck in a state of pure misery.
That's probably what annoys me most about these chapters, after that it's the fact that he is a simp and just listening to what he calls logic makes my braincells die a sad lonely death