"Romeo & Juliet" by William Shakespeare. How does the character of Romeo change throughout the course of the play?

When we are first introduced to Romeo in the play, we already know a little about him, and of his family background. He is being discussed by his parents and his cousin, Benvolio, all of whom are concerned by his reclusive, depressed manner. We learn that he has been acting in a manner obviously out of character to him, going on solitary walks early in the morning "with tears augmenting the fresh morning's dew" and …

…same as his reaction to a woman he doesn't know telling him she doesn't love him - he sees no difference between the false hardships of his imagination to real life tragedies. His frequent thoughts of suicide, eventually successful, show he is as selfish as he always was, and has learnt nothing from his experiences. So I don't think Romeo's character changes in the play though his situation changes to indulge his weaknesses even more.