My Neighbor's A Murderer

A young boy has had a crush on his next door neighbor for a long time now and was planning to tell her how he feels the next day. To his dismay he is woken up out of his sleep to see her boyfriend being snuck into her house by her and this makes him jealous a bit. As he Try's to go back to sleep he can hear them flirting which causes a reaction to close his window but when he goes to shut it, he see's his neighbor on top of her boyfriend Stabbing him repeatedly. Will he be able to be quiet and overcome his newfound fear of her or will he be the next victim ?