Felix swears that he doesn't like you more than friends, he denies this to everyone who asks him, even though he is super jealous of you.

u are in the school break time now, and a boy from your group of friends, Jaesun, starts to come closer to you and Felix was uncomfortable, but he didn't do anything, since you and him had nothing, but Jaesun was going to getting closer and closer to you, and he starts stroking your hair and whispering things in your ear, and you laugh, Felix was dying inside seeing that, he wanted to punch that boy, but he was controlling himself, but when Jaesun asks you out, he loses his temper and gets up, banging his fists on the table

Felix: "stop saying those things to her!"

he grabs Jaesun by the collar of his shirt with an angry and jealous look

"do you think you are who?"

he looks into the boy's eyes angrily, he knew he was exaggerating, but he couldn't bear to see someone flirting with you