There was a great feud against the two families of Montague's and Capulet's.
The Capulet's were throwing a mask party, and Romeo sneaked in and fell in love with Juliet the moment he layed his eyes on her.
Romeo snuck into the Capulet Orchard to tell Juliet his love for her but once he got there she was talking about how much she loves Romeo
Oh Romeo, Romeo wherefore art thou Romeo?
Romeo and Juliet got secretly married because there was a feud between their families.
Friar Lawrence (Priest)
The weather was hot and so were tempers. Mercutio was looking for a fight and chose Tybalt, who killed Mercutio. Romeo wanted revenge so slained him. Romeo was then exiled and he had to move to Mantua, so him and Juliet would never be able to see each other anymore.
Tybalt (Capulet and Juliet's cousin)
Mercutio (Montague and Romeo's best friend)
Once Romeo arrived to Mantua he hid in Friar's cell. Romeo wanted to kill himself because he knew he would't be able see Juliet anymore. Friar went back to Verona to give Juliet a potion that would make her fall asleep for 48 hours so she could fake her death and sneak back to Mantua. Romeo went back to Juleits tomb and thought she was dead(she drank the potion) so he killed himself next to her, and when she woke up she killed herself because she saw that Romeo was dead.