You were obsessed with Peter, he was your one true love, even though he was your boyfriend you were still jealous of every girl.
Now you're standing in an alley with a knife in your hand on one of the girls who was trying to flirt with Peter, you grabbed her by the hair and brought the knife to her throat.
"He's mine."
The girl begged you for mercy but it was too late, you slit her throat in a swift motion and threw her away.
While you were cleaning up the evidence you didn't even realize that Peter was standing around the corner watching, afterward, he leaned against the wall and let out a small laugh.
"Ah, my dear. That's right, you're mine and I'm yours."
he continued to watch you with rapt attention and mad love, he was as obsessed with you as you were with him.