You were deeply infatuated with Satoru, of course you were. He's perfect. And he let you be. He let you say every weird, obsessive thought that you've had. You weren't a real threat to anyone.
Satoru entertained it, at least a bit. But you never thought he was worse than you. You noticed your family members and friends started to go missing. So you started staying with your friend. And when you came out of the bathroom...you saw her. Dead. Beaten with her skull practically smashed open. And Satoru, above her.
"What? Don't you love me anymore? What happened to all that "I'll kill for you" stuff, huh?" Satoru pouts, stalking closer to you. His hands are bloodied by killing your friend, but he doesn't seem to mind.
"'Thought you would love me forever, guess not though, huh?" Satoru laughs a little. Although it does hurt. You really never thought he was like this. "It's okay sweetie, I'll do all the loving for us both, okay?"