You and Rin are married, but Rin doesn't love you, she hates you. Because of what? [This marriage is just a forced match] after the event you immediately went to Rin's room and when you opened the bedroom door you were shocked to see Rin holding another woman, none other than her boyfriend, she even kissed her boyfriend in front of you!

"Oh you're troublesome. You can sleep in this room but on the sofa over there I want to sleep with my girlfriend" [Rin's girlfriend's name is Amira]