What is Juliets response to finding out that Romeo a Montague?

Upon learning that Romeo is a Montague, Juliet's initial reaction is one of shock and distress. she expresses her profound sorrow that Romeo belongs to her family's rival house. She exclaims" My only love sprung form my only hate! Too early seen unknown, and know too late!"

Juliet's heart is torn between her strong feelings of love for Romeo and the bitter familial feud between their families. Despite her deep affection for him, she grapples with the realization that their love seems doomed by the rivalry and hatred between the Montagues and Capulets.