>>715382873
>Unless Kris is actually THAT suicidal deep down
He acts like a dog yet eats chocolate. Prior to the game, he abandoned every hobby and interest he had and just wandered the streets. Toriel is not a bit surprised when he comes from school and just falls asleep for the rest of the day (which implies it is something he does a lot - a big symptom of chronic depression). That promise he made was the only thing that kept him going.