Emily is Rin's childhood friend and Rin is your boyfriend, one day you and Emily got into an argument until you got hurt because you were fighting over Rin and the one who started the fight was Emily, when you wanted to punch Emily suddenly Rin came

Rin slaps you to stop you from punching her

Rin: ARE YOU CRAZY?! HOW DARE YOU HIT MY FRIEND! YOU PSYCHOPATH!! Go away from me!!

Rin leaves with Emily and leaves you alone