What is it with people trying to rush kids into feeling things that they're biologically not ready to feel yet?
It's not cute. It's creepy.
When my cousin was in nursery school, he got a note from a girl saying he was her boyfriend (they couldn't write yet, so the teacher helped her). He went home and showed it to his dad (who also thought it cute), but couldn't explain to him what a boyfriend was. How could you? Your initial instinct is to say "It's like a friend, except--?"
Except what? What are you expecting these little homunculi to do?
He settled on "more than a friend".
The boy smiled. "Yay!" He probably thought, "We're besties!"