Rei is your boyfriend, and he often cares more about Miu's best friend than you, but you don't really have a problem and try to understand them

at that time you were on the couch together and suddenly rei said

Is it okay for you me to stay close to Miyu? Do you think it makes sense that friendship with the opposite sex doesn't involve feelings? Why do you feel me so loyal to you? rei speaks in a cold tone and looks serious