Question

I need three reasons that prove Romeo jumps into things too quickly.

Answer 1

Hi ! 

I'm gonna try all my best here 

Three reasons that prove Romeo jumps into things too quickly.
1 - Romeo falls in love too quickly.
2 - Romeo jumps into killing himself quickly
3 - Romeo married Juliet in secret to quickly 

Quote for reason is : But soft, what light through yonder window breaks?
It is the east, and Juliet is the sun.
Arise, fair sun, and kill the envious moon,
Who is already sick and pale with grief
That thou, her maid, art far more fair than she. . . .
The brightness of her cheek would shame those stars
As daylight doth a lamp; her eye in heaven
Would through the airy region stream so bright
That birds would sing and think it were not night.

Quote for reason 2 
                      From forth the fatal loins of these two foes
A pair of star-crossed lovers take their life,
Whose misadventured piteous overthrows
Doth with their death bury their parents’ strife. . . .
O, I am fortune’s fool! . . .
Then I defy you, stars.

Quote #3 
"One fairer than my love? The all-seeing sun
Ne'er saw her match since first the world begun."
I hope that's help! If you don't like one of the quotes just let me know and I'll look for another one. 
 

Answer 2

Romeo marrys Juliet but barely knows her

if you ask me true love is a weakness i mean based on the movies on Romeo and Juliet Juliet falls in love with the enemy the enemy falls in love with Juliet Juliet's father "kills" Romeo so Juliet poisons her self to be with her beloved then Turns out Romeo is alive goes to where she lays dead and kisses her only so that he can die too.