What Events in the play of Romeo and Juliet do you think changes the course of action from romance to tragedy?

Romeo and Juliet, two lovers who long for eachothers warmth and love. Romeo and Juliet's love caused horror and pain for both families, the Capulets and the Montagues. The epic tale went from romance to tragedy because of the irrasponsibility of the characters.
<Tab/>The tragic story took place in the city of Verona. The familes of Romeo and Juliet have been torn apart for a reason beyond the text. Juliet belonging to the house of Capulets and Romeo of the Montagues. Romeo and Juliet meet at a party thrown by Juliets father, Capulet. Juliet and Romeo fall in love instantly. A…