During Scene 1 Romeo is sad about Rosaline and talks to Benvolio about it. However at the same time the Montagues and the Capulets are fighting each other.
What's wrong Romeo
Rosaline!
After Paris got arranged to go to the Party and Romeo also decided to go after he finds out that Rosaline is going to be at the party, the Nurse and Lady Capulet tell Juliet that she has to go to the party to see Paris
You have to go to the party
Fine i'll go
During the last Scene in Act 1 Romeo and Juliet spot each other from across the room at the party. Then, they talk and instantly fall in love
After the party Romeo sneaks into Juliet's castle and they have a roller coaster of emotions talk. Then, they propose the idea to get married
I love you!Let's get married
I love you too!Let's get married
Romeo goes to Friar Lawrence to ask him to marry him and Juliet
