[TYBALT under ROMEO's arm stabs MERCUTIO, and flies with his followers] Mercutio. I am hurt. A plague o' both your houses! I am sped. Is he gone, and hath nothing?
Romeo didn't want to fight Tybalt, so Mercutio offered to duel in his place, hence the death of Mercutio
What storm is this that blows so contrary? Is Romeo slaughter'd, and is Tybalt dead? My dear-loved cousin, and my dearer lord? Then, dreadful trumpet, sound the general doom! For who is living, if those two are gone? 1790 Nurse. Tybalt is gone, and Romeo banished; Romeo that kill'd him, he is banished.
Juliet thinks that Romeo got killed, but then she finds out that Tybalt is the one who got killed, and the nurse seems more affected due to Tybalt being her friend
distemperature
Definition: a state of disorder
flecked
Definition: having small marks or spots
devise
Definition: A plan by careful thought
f love be blind, love cannot hit the mark. Now will he sit under a medlar tree, And wish his mistress were that kind of fruit As maids call medlars, when they laugh alone.
This is indirectly a sexual reference, as it represents Romeo's fascination with Rosaline
But to himself so secret and so close, So far from sounding and discovery, 170As is the bud bit with an envious worm, Ere he can spread his sweet leaves to the air, Or dedicate his beauty to the sun.
Based off of this quote, it sounds like Romeo is a very secretive and private person and doesn't like to express his feelings like how worms destroy plants before they blossom.