How does Juliet react to falling in love with Romeo before she knew he was a Montague?

Explain the reaction to both of them. Did Juliet expect this? Did Romeo expect this? Do you think the reactions were worth it?

Further research,

Aslan, I have not found any related context works of Shakespeare's Romeo and Juliet. Could you possibly hook me up to a link or an E-text link to help? Thanks!

The context works must be from Romeo and Juliet. It cannot be from Shakespeare's biography.