Spellbound (1945)

Dr. Constance Petersen is viewed by her male colleagues at Green Manors, a psychiatric hospital in rural Vermont, as an ice princess for immersing herself in work at the expense of an active social life. That changes with the arrival of Dr. Anthony Edwardes, the new chief of staff who replaces Dr. Murchison, his early retirement due to burn out. With an immediate spark between the two beyond his specialty being cases of guilt complex of which she has a current troubling case, Petersen and Edwardes admit their romantic feelings for the other. But shortly thereafter, Petersen notices in Edwardes some troubling signs that he too is suffering from some sort of mental breakdown, triggers for him seemingly the color white especially with dark parallel lines against it. She soon discovers that what he is suffering from is amnesia. As she tries to help him regain his memory partly through psychoanalysis, they have to hide what is going on from the others especially as he believes he may have murdered someone. That belief may place her life in danger at his hands if he being a murderer is reality.

IMDb: https://www.imdb.com/title/tt0038109