As Romeo went to the Capulet's party to visit Rosaline, Juliet has caught his eyes. He decided that his feelings for Rosaline has changed for Juliet. Juliet's beauty has attracted Romeo attention the whole time as he was enjoying his enemy's party.
Romeo was so in love Juliet that he went back to visit her at midnight just to see her. When they met each other up by Juliet's room, they kissed, then planned their wedding for the very next day.
The very next day, Romeo had told his father the Friar that he is actually going to get married with their enemy's daughter. The news also shocked Friar because he thought that Romeo had feelings for Rosaline, but as they talked it out, Friar had agreed to let them to be married.
When Juliet was told that she was going to be wed with Paris, her heart was crushed because she did not like him. She cried and talked with the Friar about it, then he had set a plan to help her. He had told her to drink a potion the day before her wedding is about to start. Then as they held her funeral, he'll have Romeo to come and rescue her and leave for Mantua.
As days went by Romeo hasn't heard or any messenger about his family nor Juliet. But when his servant went out to the city, he brought stories back to Romeo about Juliet's funeral. After hearing that, he then got to a drug shop and asked for some poison so he can actually drink next to Juliet's grave. Now there's a plot twist where he kills himself by her grave, and then Juliet wakes up from her coma seeing his dead body.