In Greek mythology how do Psyche's sisters create doubts about her future husband?

Answer 1

Psyche's sisters create doubts about Psyche's husband by telling her that they knew that he was a fearful serpent, and though he seemed kind, he was going to eat her someday. This ignites fear in Psyche, as "there must be something very wrong for him so to shun the light of day".
After Pysche told them about the nights visits, they were envious and replied that it was dark and she couldn't see who it was. They said it was most likely a terrible flying serpent in disguise and not a winged prince.