In Romeo & Juliet How does romeo's mood change through out act1.?

I am doing a report on romeo %26amp; juliet and i need help on how romeos mood changes from sorrowful to joyful throughout act 1In Romeo %26amp; Juliet How does romeo's mood change through out act1.?
Romeo starts out sorrowful because he is love with a girl named Rosaline who has sworn to chastity. (which means she'll remain unmarried all her life, keep in mind he's never met/talked to her before.) Then he is joyful when he recives word that the Capulets are throwing a party and she is invited. Which makes him ready to crash the party and hopefully make Rosaline fall in love with him, but of course later on you know he falls for Juliet. (I read Romeo %26amp; Juliet a few months ago so im entirely sure if he's heard about this party yet but i dont remember anything else that couldve made him happy)In Romeo %26amp; Juliet How does romeo's mood change through out act1.?
He and Rosaline, his ';love';, break up.. he is sad, mopey, desperate, hopeless, etc.. until he and his cousin and the others crash the Mascaraed ball at the Capulet's mansion, which is where he first encounters Juliet.. where they fall in love at first sight..Romeo has, at this point, forgotten Rosaline, and is extremely smitten with Juliet.. all within a very short amount of time.