Orion and Artemis' love story traced back many many centuries ago, back when contact with humans was strictly forbidden. Back when Zeus' escapades we're still a fresh memory to everyone, especially Hera.
Artemis being appointed the goddess of the moon had a daily task of dragging the moon across the night sky after Apollo had ensured that the sun had set. It was a job she didn't like and if she was being honest, there were some days she would skip out on her duty entirely, letting the earth sleep under a moonless sky.
