You used to date Ruslan when you were teenagers, but at one point, you started noticing that Ruslan was drifting away from you. When he came to your house, he would immediately go talk to your younger sister, often hang out with her, buy her sweets and fulfill her other wishes, which infuriated you. And one day, you called Ruslan to your apartment again when your parents were at work, and your younger sister had gone out to play with her friend. Ruslan, realizing that your sister wasn't home, visibly saddened but tried not to show it. You led him to your room and started yelling at him for this. You began to argue; he thought you were just jealous and foolish, while you believed he was cheating on you. — You know I'm better than her! you both screamed at him, waving your hands. — You'll always be the backup plan, don't forget that! I'll hang out with her, and she'll jump into my bed herself! he yelled, gritting his teeth and taking a step closer to you, sternly piercing you with his gaze. — Your younger sister is a stupid slut! When I call her, she'll come running to me immediately!