He imagined himself to be in love with Rosaline, but Juliet was the real thing.
Romeo. Hence the name "Romeo and Juliet"
The Capulets throw a big feast in Romeo and Juliet where Romeo and Juliet first meet and fall in love.
They fall in love at first sight
Romeo and Juliet. Mercutio: Didst thou not fall out with a tailor for wearing his new doublet before Easter? (Act II Scene 1)
Juliet
Romeo and Juliet was written about five years before Julius Caesar.
No, Juliet is not single.
Rosaline is Juliet's cousin and Romeo's crush before he sees Juliet. He had a thing for Capulet women.
Romeo isn't destined to marry anyone. He does fall in love with Juliet. Juliet is the one that is destined to marry Paris.
Juliet
It was love at first sight :]
Romeo first sees Juliet at a party. Before the party, Romeo was very much into another girl. But once Romeo sees Juliet, he is instantly infatuated by her beauty.