What is the significance of the second prologue by the Chorus in Act II of Romeo and Juliet?

It is interesting how Act II begins with another Prologue
which is actually written in sonnet form. If we look at what this prologue tells us, we
can see that it offers us a summary of what has happened, comments upon it, and then
gives us a brief idea of what is to come in terms of the plot of the play. Note how the
first four lines tell us how Juliet has surplanted Rosaline in his
affections:

readability="9">

That fair for which love groaned for and would
die,

With tender Juliet matched, is now not
fair.

Of course, many critics
question the steadfastness of this love, for if Romeo is so quick to love another, what
does that say of his ability to love in the first place? However, this prologue makes
clear that his feelings are returned by Juliet, as both are "bewitched by the charm of
looks." However, the prologue continues to explore their situation and how, in spite of
their love, they face massive barriers due to the feud between their families. However,
the final couplet of the prologue gives us as an audience an element of hope, as we are
assured that, in spite of the difficulties, they will be able to meet
again:

But
passion lends them power, time means, to meet,

Temp'ring
extremities with extreme
sweet.

The prologue thus ends
with a play on words that predicts they will be able to pursue their love, but that this
"extreme sweet," or very sweet delights, will be met with "extremeties," or
difficulties. Thus this prologue comments on what has happened, reminds us of the
situation, and gives us a hint of what is to come.