A Dedicated Man (1982)

Edith is a hotel waitress, single and in her mid-forties, with a major infatuation on Maurice Silcox, the hotel's head waiter. But Edith becomes distraught when she learns that Maurice has been offered a more prestigious job at a luxury hotel. Maurice explains to Edith that he can only take the position if he is married. Unaware Edith's crush, Maurice proposes. She accepts and they set up a household for business purposes only -- complete with a photograph of a make-believe son. As Edith continues to live with this charade, her obsession with Maurice and the "son" grows, leading to a shocking and disturbing outcome!