Romeo's rash actions from the beginning to the end of the play lead to disastrous consequences, including his own death and Juliet's suicide. When Romeo first falls in love with Juliet, he is on the rebound from being rejected by Rosaline. (It's always wise to have a cooling-off period between relationships to make sure that one's emotions aren't running wild.) Romeo sees Juliet and immediately proclaims her to be the loveliest person he's ever seen. Does this warrant rushing into a relationship that will certainly be problematic? Romeo doesn't stop to think of that—he lets his eyes rule his brain.
Within minutes of meeting Juliet, he has kissed her twice. Jumping into a physical relationship, especially with a young and inexperienced partner, before getting to know the person is also unwise. Throwing caution and clear-mindedness to the wind, Romeo agrees to marry Juliet on the very night they meet, and he has soon talked Friar Lawrence into performing the ceremony.
All that hastiness...
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