Sato sensei is jealous of how wonderful Karl's relationship with Mai is.  This is not too hard to believe when you think of what marriage was like for Japanese women back in the day when she got married.  Men worked all the time and women took care of the house.  They barely saw each other and led two different lives.  For many Japanese people, it's still the same today.  Have you experienced anything like this?  Talk about it in the comments or on the FRIED CHICKEN AND SUSHI FACEBOOK PAGE!