A Village Affair (1995) on Netflix

Alice has married the rich but boring Martin. When they move to a small village Martin starts flirting with Clodagh, but she is more interested in his wife Alice.

Alice and Martin Jordan and their three children move into their new home in a small village. They're a happy family even if Alice finds her mother-in-law Cecily Jordan, a well-known and much published author on English gardens, somewhat overbearing. She was also once an avid painter but hasn't worked on any pieces for some time. They soon learn that there are few secrets in a small village, but they find this amusing. They are soon invited to dinner by Sir Ralph and Lady Unwin and meet their daughter Clodagh, who has recently returned home after a scandal in New York. Alice and Clodagh are soon lovers, and when Martin's brother Anthony visits, he is the first to realize what is going on. The village is soon abuzz with rumors.

—garykmcd