Sinking Sand (2016) on Netflix

Plot summary

Brooke McHenry longs for a calm and steady life, but her husband Daniel is a prosecuting attorney and a candidate for the Senate, and his work leaves her on her own. A handsome swindler gives her the attention she misses. She keeps the relationship from becoming physical, and when one night it nearly does, she ends it. She then finds that he has recorded their conversations to use them against Daniel. Fear that her marriage, her husband's career and her life could be ruined, she goes after the recordings. She swings at the device and hits the man. Then she learns that Daniel is prosecuting someone else for what happened, and she cannot bring herself to tell him.