This theme for popular music includes the scenario where the woman barely knows the man exists, as well as the scenario where the woman used to love the man but doesn’t anymore. Other themes, like “I’m alone and I don’t know anyone I could ever love and I’m unhappy about that,” or “I’m together with the person I love and I’m happy,” are way way behind.
If science fiction is stuff that could happen but hasn’t happened yet, then what if I write a story about aliens on another planet living their daily lives three thousand years ago? Is that science fiction? It could happen, but according to my story, it’s happening in the past, not the future, so it has happened. And it doesn’t even necessarily involve any science or technology.
And what if I write a story that includes aliens and robots but also wizards and witches? Is it both science fiction and fantasy? Clearly these definitions need some work.