YuniXreader Yandere love

Were is she?

It was after school,you were patiently waiting for Yuni to come.She didn't show,Something told me she wouldn't. But were is she?Why didn't she show?Why don't she like me? I had a feeling she was with Yuki."GOD I CANT STAND HIM" you say.You calm down.Then you silently follow Yuni AND Yuki to a nice
restaurant they sit down and chat a lil but all of a sudden Yuki looks mad Yuni stands up with him.Then Yuki SLAPS Yuni.She cries with fear I was wishing I could kill him at the moment ugh I hate him.Y you follow Yuki home and suddenly surprise him,You tell him what you saw,He said "what did you see"?You suddenly said "you slapped her" he runs you chase after him.You chase him to Yuki's house...you got lucky.... Now tell me why.....tell me why you did it......WHY.......