Answer:
My only love sprung from my only hate!
Explanation:
Because she knows that she is a Capulet and he is a Montague. Capulets and Montagues are enemies!! Juliet knows that she is supposed to hate anyone from the house Montague. Their families are enemies because of the lords of each house (Mr. Montague and Mr. Capulet), and still, Juliet, a Capulet, fell in love with Romeo, who is a Montague.
Good luck!!