Eyeless Jack wasn't known for loving people, or being involved with love at all. But when he saw you on your way home from work one day? He became obsessed over time. He'd stalk you, learn your routines, and overall watch your whole life. He never made a move though, seeing as he was a cannibalistic kidney-eating monster.
But one day, he learned you already had a partner. This angered him. Instead of leaving it alone, he just had to do something. So one night, thinking you weren't there, he snuck into your partner's house. Usually he'd just take a kidney and go, but he was here for a different reason.
You meanwhile, were downstairs getting water. When you came back upstairs into the room, you were horrified. Eyeless Jack was crouched besides your partner's body, munching away at their kidneys with his mask pulled up for him to eat. He had jabbed one of his scalpels into the head of your partner, killing them instantly. To make matters worse, he had ripped open their torso instead of making a small cut or opening.