At the beginning of the play, Romeo seems quite mature, in the sense that he is in love, and growing up. However, immaturity is beginning to arise, as Romeo shows that he cannot cope with the unrequited love haunting him: Ay me, sad hours seem long'. We can see from this that Romeo has no intention of attempting to forget about Roseline. This proves that he is in fact quite immature. On the other hand, being in love and to such a degree as this, shows a growing sense of maturity about Romeo.
Further into the play, at the Capulets' party, Romeo enters in disguise, soon to meet Juliet. The fact that he has turned up, uninvited, to this party, shows us that Romeo has quite a rebellious nature. This immaturity is also reflected when Romeo first meets Juliet. After spending every morning and evening, every waking hour thinking about Roseline, it seems rather immature how he can completely forget her and say that he has ne'er seen true beauty till this night'.
The hyperboles used in this scene depict the strength of this love Romeo is feeling for Juliet: She doth teach the torches to burn bright! This very exaggerated statement shows that Romeo is perhaps not very experienced with love, as all he can see are the positive sides of Juliet. Also, here he is assuming he is in love just by what meets the eye. These factors all show us that Romeo is in fact regressing into an immature character, who is quite naïve enough to not know what real love is.
However, as the play progresses further, we begin to see a new side of Romeo, beyond first impressions and closeness of superficial emotions. Romeo visits the Capulets' Orchard in Act 2 Scene 2. Here, the reader begins to see a much more...