The final words, "good friend," were a mockery of Rosalyn's betrayal.
Even though she knew deep down that the one who betrayed her wasn't Rosalyn but Cyrus Taylor, she felt uncomfortable and refused to acknowledge that Cyrus liked Rosalyn. Stubbornly, she pinned the blame on Rosalyn, who ultimately chose to ensure her happiness. Yet, no matter how angry or upset she was, her nature remained too timid.
She was afraid of losing her happiness, and even her provocations were cautious, fearing that the two of them would notice.
Timidly, she chose a timid way to accept her good friend's concession and forgive her boyfriend.
This scene was the turning point of the whole movie. Afterward, Rosalyn would leave the country to fulfill her friend's wishes, and they wouldn't meet again until many, many years later when they had grown up.
Lydia Bell knew this scene was important. She had prepared extensively in advance, seeking the guidance of a specialized acting teacher several times.
