OP forgot the best part
did he try to stab her?
No, he was trying to cut off his pinkie finger as an apology.
The running joke of the manga is that he used to be a high-ranking yakuza enforcer who’s having trouble adapting to civilian life. Hence her shocked face when she saw the decorations and the creepy way he sang “Happy Birthday”; it’s a traditional birthday celebration for your oyabun, not your wife.
oh my god, i just realized, this means he sees her
AS THE BOSS IN THE RELATIONSHIP
He see’s her as his direct boss, but the group’s head is the Women’s Association Chairwoman: