The Browning Version, a film by Anthony Asquith.
This is the original film with Sir Michael Redgrave, who won for his performance at the Cannes Film Festival of 1951.
Sir Michael portrays Andrew Crocker-Harris, middle-aged schoolmaster, whose marriage is a sham, who is loathed and feared by his students, and who will be leaving the school at the end of the term, due to his poor health. His wife is carrying on an affair with one of his fellow schoolmasters, who believes that Andrew is unaware of the affair. As the term is ending, one of his young students comes to him for a private lesson, this young fellow displays admiration and respect that causes Andrew to re-evaluate his career. Andrew's wife, although disloyal to their marriage vows, is always honest with him, to the point of cruelity.
We watched this film last night. It is in glorious black and white.