Romeo and Juliet both grew up in haughty, first class households, where they were provided with everything they wanted and needed, not to mention a broad education including proper etiquettes. Juliet is a very courageous and loyal person to Romeo, for she not only stands up to her parents, but to systematic way of life that has existed for hundreds of years (arranged marriages). Shes tells her mother immediately at the ball that she will only meet Paris because she wants her to and not because she is voluntarily interested in him: Ill look to like, if looking liking move.
But no more deep will I endart mine eye Than your consent gives strength to make it fly. (1,iii,98-100) Romeo on the other hand shows courage, but not the same kind. He has a loving relationship with his father, and his courage is shown by him perusing his love for Juliet, knowing the consequences of associating with a Capulet. Since men could marry whoever they wanted, I wouldnt call him courageous. Juliet also qualifies as devoted, after the nurse tells her that she should just go ahead and marry Paris, she says she will kill herself if she is forced to marry Paris.
She would rather take her own life than to have a life without Romeo: Ancient damnation! Oh, most wicked fiend! Is it more sin to wish me thus forsworn, Or to dispraise my lord with that same tongue Which she hath praised him above compare So many thousand times? Go, counselor. Thou and my bosom henceforth shall be twain. Ill to the Friar, to know his remedy. If all else fail, myself have power to die. (3,v,235-242) Juliet has already heard the nurses advice, she will talk to the friar, and if he doesnt tell her what she wants to hear, she will kill herself.