Juliet rushes to the Friar after hearing the news about Romeo's exile. She says to the Friar
Do thou but call my resolution wise, / And with this knife I’ll help it presently / She shows him her knife (Shakespeare 4.1.54-56). Juliet is determined to keep her promise of marriage to Romeo. Juliet's love for Romeo is so intense, she is willing to die to keep her promises to him. The depth of their love makes Juliet not think about her actions and make her act upon the impulse decisions without caution.
Romeo means so much to Juliet she is thinks there is no reason to live without him. Juliet could move to Mantua with Romeo. She instead let's love control her actions and she acts impulsively. Juliet wakes up and finds Paris and Romeo lying lifeless on the floor. She hears a noise and stabs herself with Romeo’s dagger saying “Yea, noise? Then I’ll be brief. O, happy dagger, / This is thy sheath. There rust, and let me die.” (5.3.174-175) Juliet proves how love forces people to make impulsive actions. Juliet is so ridden full with grief because her lover has died, she is willing to be a “sheath” for a “happy dagger”. She is so resolute to be with Romeo that she will even be there with him in death. Juliet could find another love, or go and live with Friar Lawrence. Instead she chooses to act impetuously and allow love to control her. Juliet's willingness and rapidity at which she kills herself shows how love causes people to act impulsively. The decisions Romeo and Juliet make, show how love leads to hasty actions.