They give the poem more details and make it more coherent. Symbolism helps the reader connect to the poem more as well.
Answer:
A-To represent your point of view
The lines "...but he was 'ware of me/ and stole into the covert of the wood..." and "...And gladly shunned who gladly fled from me..." shows that Romeo is fleeing from Benvolio. In the first line that demonstrates that Benvolio is being avoided, it tells how when Romeo saw his friend, he ran into the woods. In the second line, it shows how Benvolio is slightly upset but says that he will gladly shun he who gladly avoids him.