I saw this American movie on TV about 10 or 15 years ago and it could well have been a made-for-TV movie. I was intrigued by the twist in the tale but can’t remember the title. No well-known actors in it, if I recall.
Movie is about a female real estate who truly believes she is married to the male in the movie. The opening scene is, I think, one in which she gets out of her double bed in the morning and there is a photo of the man beside her bed. You, the viewer, think that she is married to the man but all is not what it seems. She actually has mental health problems and is not in a relationship with this guy but thinks she is. The whole movie is shot in such a way that the viewer also believes that she is married to him. She has therapy sessions. She is a dangerous woman.