Look deeper into the meaning of “The Sick Rose”

~
O Rose thou art sick.

The invisible worm

That flies in the
night,

In the howling storm,



Has found out thy bed

Of crimson joy,

And his dark secret
love
Does thy life
destroy. 
~




Slightly
looking at this poem, my first impression is; this is a really simple poem. It
would be really easy to be understood since it only consists of a couple of
sentences telling the story about a