D.P.
So maybe I don't see the big deal here. I had a little boyfriend crushes in 1st and 2nd grade- not anything like the more mature type of boyfriend I had in high school or college. My opinion is that it's just innocent stuff- puppy love. I joke with friends' kids about this age all the time about them having a boyfriend and/or girlfriend. They get all bashful and giggle. I also taught elementary school, and it didn't seem all that unusual for little boys or girls to have crushes and send innocent little love notes to each other at this age. My observation was that there wasn't even any physical contact between little boyfriends and (no hand holding, kissing, or hugging).
You can turn off the TV, but boyfriend/girlfriend references are everywhere- Mickey and Minnie Mouse, Donald and Daisy Duck, most of the Disney "princess" movies.