How does sybil change in the picture of dorian gray?

When Dorian first sees Sybil Vane, she is an actress on stage - she is an art; however, when Dorian and Sybil meet, and Dorian confesses his love to her, something in Sybil changes. Her change can be undoubtedly be seen in chapter seven, when she performs on stage in as Juliet, the play in which Dorian and Lord Henry go to see. Sybil exhibits none of the poise, skill, emotion, or grace as she had before. Instead, she "showed no sign of joy when her eyes rested on Romeo" and "the staginess of her acting grew worse as she went on. Her gestures became absurdly artificial" (87). Sybil is no longer an actress; she is no longer an art. She no longer sees herself as only an actress in life. Now, she has committed herself to reality, and Dorian is furious. Dorian only loved the art in Sybil because Dorian himself is an art, and his painting is his reality. After the show, Dorian tells Sybil in an outrage that "you have killed my love" (91). The next morning, despite Dorian's changed state of mind to write Sybil an apology letter, he hears news that Sybil has died by probable suicide.