Happily Married (1970)

The film is, ironically, about the breakdown of a marriage that began with love. Although the skillful blending of the mystery and relationship drama revolves around the couple, a motley bunch of characters keep cropping up, saying and doing bizarre things that may not always make sense, but as the plot unfolds, it all transforms into a psychological game of 'what' and 'what next?' In short, it's a nail biting psychoanalytic thriller shows the troubling inner workings of a toxic marriage reveal themselves in surprising ways after one of the couple's feuds spins out of control.