Too Close for Comfort (1980)

S1E16 What's Wrong with Mr. Right?

A woman shows up at Sara and Jackie's home, confronting Sara about an alleged affair with her husband. However, she has mistaken her target; it's actually Jackie who has been involved, and she doesn’t see a problem with it since she and her husband are separated. Despite this, Jackie starts to sense that her relationship might be reaching its conclusion sooner than she anticipated.