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:
TheLiteralDevil 