What the language feature of the song perfect by ed Sheeran​

This is a song that tells about a man's love affair (the song writer) with his girlfriend, when he was a teenager. Although adolescent love relationships (love monkeys) look sweet, beautiful and even ridiculous, these relationships often fail because of various things. Some people forget the story when they grow up, some can't move on from the story, including the songwriter. And luckily, the songwriter got a second chance to fall in love again with his girlfriend as a teenager. They then share "perfect" love.

Penjelasan:

As far as I know it … sorry if wrong

that song is the way of Ed Sheeran to express his love for his girlfriend