A Little Poetry
Poetry is an incredibly versatile genre – you could use it to say literally anything. For example, with poetry, you can give your insults a more poetic edge.
This person chose to easy way out by copying a pre-existing and well-known poem. But, instead of the original romantic message, this new version expresses something much harsher. It seems as if they’re ready to get rid of their ex based on what’s been written here.