I added this as an addendum to a Pubski a while ago, and no-one bit. I was teaching the preschoolers to say "I love you" in spanish, and then "I love you forever". A kid asked what the difference was, I told him. He asked what forever means, I told him. Then he asked "where does the love go when you die?", and after a while of not having any idea how to answer, I said "you keep it with you". What would you say?
"You share it with the world, all of it. A bit of how much you loved someone goes to each person around you". People see if you're a loving person, and your love inspires others. In a way, you never really die: your essence is there, forever, in ideas people got from your existence, an influence on the world.
What would I tell a preschooler? Hoo, boy. I have no idea. I'm terrible at guessing or even intuiting where a child is along the developmental schedule when I interact with them. Three years old... can you talk? Ok, can you read? What about an eight year old, are they still pathologically selfish? Oh, that's only boys? Et cetera. I would probably say that the love stays with those who are survived by the dead. It accretes and ossifies... ok, those words are probably above a preschooler. I'd say something like Love is indivisible. Do they know fractions? Good on preschool teachers.