In the excerpt from Harold Pinter's "Betrayal," Emma reveals to Jerry that she has discovered her partner's longstanding infidelity. She expresses her shock and feelings of betrayal, noting that he has been unfaithful with multiple women over the years. Jerry is taken aback by this revelation, responding with disbelief.

The conversation unfolds further with Jerry acknowledging their own betrayal of him, suggesting a complex relationship dynamic. Emma reinforces the cycle of betrayal, indicating that neither she nor Jerry had been aware of the depth of their partner's disloyalty until now. This exchange highlights themes of deceit and the intricacies of personal relationships.