I wonder why that girl from his hometown wouldn't have reported something so serious? He could have been charged with making death threats.
I can, from 12 thou klms away answer that one. She didn't want to dob a classmate in. It's only words. Its a universal truth that boys say this to girls in highschool on a daily basis all around the world. He probably said to everyone in the class ( he was super into himself ) .. She says he said it, he says he didn't. And so on.
But she didn't forget it, and she didn't move on from the frisson of instinct that told her he was weird and not a person to attempt any more social interaction with that was unnecessary from then on.