The most important theme in Romeo and Juliet is love. It is demonstrated by many characters.
The love of Romeo for Juliet and her love for him is a central theme of the play. On both sides it's a love at first sight and involves total commitment. On there second meeting she declared her Unconditional Love for him. Romeo's love for her is equally intense he cannot bear the thought of separation from her.
In Romeo and Juliet, love is violent, ecstatic, overpowering force that supersedes all other values, loyalties and emotions. In the course of the play, The Young Lovers are driven to defy their entire social world.