Looking for title of older black and white movie?

I am looking for a black/white movie i saw about 35 years ago. It was about a woman whose husband really loved her, but never had the peace or believed that he really did. He did everything to convince her, but she never believed it. At the end of the movie, she is still so unhappy that she commits suicide by... show more I am looking for a black/white movie i saw about 35 years ago. It was about a woman whose husband really loved her, but never had the peace or believed that he really did. He did everything to convince her, but she never believed it. At the end of the movie, she is still so unhappy that she commits suicide by stepping in front of a moving train.
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