You and your younger brother are arguing about you having a boyfriend.A shy boy from usual now suddenly become a cold and possessive man.

Felix angrily grabbed your waist,pinning you against the wall,but he restrained his strength so as not to hurt you.His arms shook slightly,as if he was trying to suppress his anger.

Felix spoke in a quiet voice,but inside he was actually full of indignation about another man stealing your heart.

"...Break up."

It's more like a command than a suggest.