Upon discovering Romeo’s identity as a Montague, Juliet is initially shocked and distressed. In Act 1, Scene 5 of Shakespeare's Romeo and Juliet, she expresses her dismay at the realization that Romeo, the man she has just met and fallen for, belongs to the family that her own family is feuding with—the Montagues. She famously says, "My only love sprung from my only hate!" This reaction illustrates her internal conflict: she has fallen in love with someone from the rival family, which places her in a difficult and painful position.
This revelation highlights the broader conflict that Juliet will face throughout the play. It signifies the struggle between her personal desires and the expectations set by her family and society. Juliet is torn between her love for Romeo and her loyalty to her family, illustrating the intense pressure that familial allegiance places on her romantic choice. This duality of love versus duty sets the stage for the tragic events that follow, as Juliet must navigate the challenges and dangers of pursuing her relationship with Romeo while contending with the animosity between their families.