Why is Romeo so sad?

Romeo is frequently sad because he is a hopeless romantic. He is not hopeless in the sense that he is without hope, however, for he does, in fact, hope for the best in his tragic situation. Romeo is hopeless because involves himself in a hopeless situation. Since the Montagues and Capulets are families with a blood feud, his marriage to Juliet would likely never be accepted. Both Romeo and Juliet realize this unfortunate fact, and though they try, Shakespeare shows that they cannot escape fate. Perhaps Romeo is always sad because deep down, he realizes this fate, but chooses to pursue love instead of preserving his personal safety. With the knowledge that his marriage to Juliet would never be accepted, it makes sense Romeo would be sad since he reveals that his love for Juliet is more important to him than anything else.