We  enter in mantua where Romeo is waiting for news from friar Lawrence. as this occurs Balthasar arrives  with bad news that is yet to be revealed. Romeo  comes as happy and asks many questions but Balthasar says that Juliet is dead not knowing that she took the potion (dramatic irony) romeo sad as ever

shouts ” I DEFY THEE STARS”

he decides to go back to verona to commit suicide and be next to his lover.