What movie is a woman who cheated on a photographer because of her husband's impotence?

It's like a covered bridge dream, right? Known as the classic of cheating. At that time, it was very confusing for a group of idiots. The marriage broke down, the wife separated and remarried. Nobody believes this now. At the end of the film, the heroine is too old and still thinking about the photographer who used to be in the spring breeze. I don't know how she faced her husband for decades.