Maybe he wanted to cling to his wife, or maybe he wanted to fill in the growing emptiness he feels. Perhaps he thought there's nothing else going on for him anymore, so he chooses to cling and persist on his grudges. Otherwise, it might feel like all that time spent on hating her and tormenting her would be a waste, and so, too, would it feel like absolving her of her "sin". So, something as trivial as her "showing beads" that distracted her brother is enough for him to pin the blame on her.

I don't understand, why does her mom blame her for the carriage thing? Low reading comprehension sorry. Does it have something to do with the beads??