Humans are wired up pretty conveniently. If someone dies, no matter how close you were, you’ll still get hungry, you’ll eat meals, and you’ll get sleepy at night. You’ll also have to work. Eventually, as you busily occupy yourself, you’ll forget those around you who have died.
Day by day, you forget, and suddenly it’ll come… a day that you won’t have thought about that person even once.
Forget about those people that has died, sometimes even people that are alive. You still experience it the same way.