You broke your promise.

Prologue

It was April 23, 2012 when I saw my older brother stab the love of his life. I had just woken up and decided to go downstairs, my mom was out of town, my dad was doing an overnight shift at the police station and I was supposed to be sleeping over at my best friend, Brandi's house. But her little brother got the flu so I had to stay home last minute. I skipped tiredly down the stairs as I rubbed my eyes. I heard shuffling downstairs and a bit of arguing. It was probably Jeff and Marie. My brother and his fiancé. They had been arguing about stuff lately, probably the wedding. Marie was Brandi's older sister, and my old babysitter, well technically still my babysitter. I'm almost sixteen, I don't need a babysitter.
"What the hell Marie!?" I heard Jeff yell, he seemed upset, I mean, REALLY upset.
"It was an accident Jeff, I swear.. It just.. happened. You have been so busy at work and Al was there for me..." She said, my eyes went wide. Al was a deputy down at the police station.
"It was Al!?" He screamed louder, I winced. I had never heard him scream so loud before. I slowly started walking into the kitchen.
"Yes... It was Al. And to be honest... I think I'm in love with him...." I was able to see them and saw that he had her pinned against a wall, she was biting her lip and looking really scared.
"I gave you my everything, I gave up everything for you and you want to leave me for some wannabe police officer!?" He growled and grabbed a knife, I covered my mouth with my hands, Marie looked scared to death.
"Jeff... Come on... don't do this...." She put her hand on his cheek but he just slapped it away.
"You're cruel. I never thought you'd do this to me.... I'm sorry.. But Al doesn't deserve you and if I can't have you... neither can he." He plummeted the knife into her chest, he covered her mouth so she couldn't scream. But I did. Somehow my hands left my mouth and I was standing there screaming, tears falling down my cheeks. He immediately turned and looked at me.
"Layla.... Promise me you won't tell... I can't let Al have her... Promise me.. You're my little monkey." He smiled softly, I could barely focus, my gaze on the blood on his hands. But I nodded anyway, unable to speak. He smiled and started cleaning up the mess. I went upstairs. I panicked and went down my balcony, which had stairs. I then ran to the police station, in my pajamas..
I ran into the station completely out of breath, my dad saw me instantly.
"Layla, what's wrong?"
"Jeff. Marie. Stabbed. Her." I breathed heavily while tears fell down my cheeks, I could see Al behind my father and all the blood drained from his face. He and my father got a group together and quickly went over there, I ran back. By the time I got there Jeff was being taken out in handcuffs, by my dad. My father looked heartbroken, he even had tears in his eyes. I looked over and saw the ambulance, Al was sobbing into a body bag. I looked back at Jeff and we had eye contact, his face went cold.
"You lied to me!" He screamed.
"You broke your promise! I'll get you back, I swear to god I will!"