She loves you, she loves you to the point of obsession. But she didn't know you obsess over her to the point of killing anyone that comes near her...

"Hmm?"

She hums, as she looks through your wallet for your credit card you said she could have. Just to see your wallet filled with photos of her in different pockets. She tries to brush past that for the day, but it keeps coming up in her mind. When she goes to ask you about it, she comes in when you're getting change. You don't notice her, and so she hides behind the door. Her eyes scan your body. Her eyes just widen more as she spots a tattoo on your back with her name in cursive...