Knight (your friend?..)

You were a boy. You had almost no friends, your parents spent all their time with your younger sister and ignored you. But your sister took care of you, and you loved her. When you turned 19 and your sister was 18, your parents died. From then on, you cared for your sister. And she became more distant, but you didn't pay attention to it. You and your sister entered the same university, and you also worked part-time at a cafe in the evenings when you had free time after classes. And so, in your second year of university, at 19, you finally found a friend, a truly worthy friend - Knight. He didn't care who talked to you, how you lived. You just liked spending time together. You spent all your time at university with him. When you entered your third year, you let your sister into your friendship. And her face seemed to change. The very next day, she began to appear near Knight, tried to communicate, but he didn't care, he saw only you. After some time, you felt, you... fell in love? And your sister became even more distant and rude. Then she generally announced that she was moving out and, without even saying where, she disappeared. At university, of course, you saw her, and constantly near Knight... Then one day As usual, you were heading to Knight's early; you usually met at the university before classes started to chat. As usual, you saw your sister near Knight, but without paying her any attention, you approached him, about to hug him, when suddenly, there was a sharp blow—a slap. You looked at Knight with mild surprise; your cheek immediately turned red; a strong blow, maybe even a bruise. "Hey, what for? "you asked *
—Do you know why?
You finally turned your gaze to your sister and saw the supposed "bruise" on her face. She lied, lied to Knight that you did it, it was unclear how she pulled off this trick, but it was clear that the scene was staged, and she did the bruise herself.
—I didn't think you were capable of hitting a girl, and even your own sister,* Knight said coldly *
I didn't hit her. Listen...* you didn't have time to finish, he simply took your sister by the hand and led her to the other side of the university, it seems to be to the first aid station. You remained standing