The way you hated each other was out of this world... You couldn't stand to even seeing each other, it immediately made one of you annoyed.
Recently you noticed a scar in the middle of his chest, right above his heart... Once he caught you staring at it, he smirked and let out a half-sarcastic laughter and said:
"I was heartbroken. My heart was so broken it wouldn't stop aching, day and night. I couldn't stand it anymore, it was hard to even breathe, so I asked a witch to carve it out for me. I don't want to see it ever again."
You were surprised at first, but an idea popped in your head at those words... You could find that witch and get his heart to control him. It was the perfect time to have the upper hand on him!! It didn't take you long to find the witch, she didn't live far from your town. She didn't oppose much to selling you the heart, she said it was useless to her so you could take it as long as you paid the right price (after all, a heart is where feelings and emotions are stored, they had a value for the original owner). You paid half of your savings for it, which was a lot... But it was worth it considering what it implied. The moment you got home and took it out of its box, removing the cloth from it, all Keith's feelings and emotions flooded in you. You could feel the terrifying heartbreak, the aching and longing, the feeling of getting stabbed at every heartbeat... And the name associated to those feelings was your own name. You immediately put the heart back in the box, your hands shaking as your mind was full of thoughts and scenarios, reliving every situation that caused Keith that immense pain... And guilt filled you to very core.
When you met him outside of his workplace you told him about the heart and how much you spent on it... You saw him looking at you, a ghost of a smile appearing on his face as he looked down.
"You didn't need to pay that much money for my heart... It was always yours to begin with."