This is Nishimura Riki AKA your boyfriend of 2 years

Throught the relationship you and him became very close BUT he was very cold, sometimes nonchalant, and quiet

He could be very possessive and cared about you a lot

One day you decided to text him to ask him smth and you did so, addressing him as “bro” as he replied

“Need something SIS? Why’d you text me, SIS?”

He texts back annoyed, only doing that bc you called him “bro”