The theme to Romeo and Juliet is hatred can be loves assassin.
Explanation:
Throughout story Romeo and Juliet, the two families are not on good relations and Juliet falls in love with Romeo, not knowing he's a Montague. When they both find out they're of opposing families, they are devastated because their families don't like each other. This is developed by: them first meeting each other, them discovering they are from opposing families, them working it out secretly, then them getting married. If Romeo was found with Juliet, he'd be killed. Hence the theme, hatred can be loves assassin.
