Love songs will never go out of fashion. But have you noticed that most love songs are limited to the very first stages of love?
They’re almost always about two specific topics: either the excitement of meeting someone new, or the sadness of breaking up. It’s rare to hear love songs that focus on love in the decades after the "I dos".
When novelty isn't as novel
Perhaps the excitement of meeting someone new seems more interesting than the settled daily living of established relationships. There’s an appearance of novelty to it, except that when every song on the radio is about the same kind of novelty, it doesn’t quite feel as novel anymore, does it?