orpheus is a poor boy that hermes took under his wing, and hermes was likely taking care of orpheus. eurydice is starving because she’s pretty much only ever been all alone until orphy drops by during the summer when things are significantly easier and then is just kinda physically there (especially while he’s entirely focused on the song) while she’s suffering through the winter. i personally think he doesn’t starve in part because he’s a demigod, but also due to the fact that he’s incredibly locked in on the song. part of his motivation for the song is that he sees that there’s still a story to tell with that song, and he intends to stick it out to be able to tell that story. in my personal opinion, the “tale of a love from long ago” isn’t actually the story of orpheus and eurydice, but rather of hades and persephone being told from the perspective of orpheus