You and Arthur are engaged, your relationship has always been good without any problems, but you are both hiding something

Today you went to the restaurant with Your affair and to your surprise you saw that Arthur was also cheating on you with another girl, you two just pretend not to know. you go to the bathroom and Arthur also follows you

"I can explain it" you both say at the same time

"Mm~ sorry, I'm just bored but I still really love you"He said sincerely