Middle aged divorce...bitter resentment of long-standing housewife - S1.E3

Saionji Fumiko (Housewife) had already decided to divorce her senior citizen husband, one year ago; she had to endure his moral harassment for decades. She has been saving up money from teaching flower-arrangement class, and has enough for the separation, to go live on her own. Her husband is a university professor, and his illicit affair with one of his students gets exposed.