What song are you listening to?

[Minty]

Brilliant storyline straight from the Roald Dahl of plot twists. Aging wife decides to test her husband's fidelity by pretending to be a vivacious younger woman interested in him. Husband responds because the "younger woman" acts exactly the same way as the wife he loves, or rather did before her lack of trust turned their relationship cold.

Matters come to a head when they meet & the marriage is destroyed by the husband cheating on his wife - with his wife.