The Blessed Ones (1986)

Original title: De två saliga

Sune, a dropped out theology student who also is the son of a priest, meets Viveka in a church. The two connect via a theological discussion and eventually get married. As the years pass, Viveka grows more and more emotionally unstable due to jealousy and religious anxiety. Sune accepts Viveka's mental problems and, instead of seeking help for his wife, obeys her increasingly bizarre commands.