I feel sad for the yandere, the MC doesn't even seem to care about her one bit.
In the yandere stories/stalker stories I've read so far, the main character had at least some sympathy for the yandere.
But who knows, I have no scientific background knowledge on psychology, maybe it's more common to not feel any sympathy but rather act like prey in front of a potent predator if you got traumatized during your childhood by said person.