Dancing in the Dark (1986)

Via the New York Times: "To all outward appearances, Edna Cormick (Martha Henry) is the perfect housewife.... She's married to a man who'll stand up in public and say, "This is my wife," so that there'll be no confusion as to who she is. Edna has no identity without Harry, an ambitious, successful salesman who seems to love and care for Edna long after other men might become worried about her housewifely obsessions... Edna is reviewing her life - in neatly chronological flashbacks - from the room in the psychiatric hospital where she's been confined ever since Harry's sudden death."

Unfortunately the movie Dancing in the Dark is not yet available on HBO Max.