Why does Criseyde leave Troy in Troilus and Criseyde?

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In Geoffrey Chaucer’s Troilus and Criseyde, Criseyde leaves Troy because she is sent to the Greek camp to join her father, Calchas, who is a priest that has deserted the Trojans to support the Greeks.12

Although she promises Troilus that she will return to the city, her circumstances in the enemy camp—where she is isolated among Greek warriors—eventually lead her to give her love to the Greek warrior Diomedes.12