SPOILER question about the Princess's motivation at the end
SPOILER----------------------
At the end, the Princess has Heurtebise take Orpheus back in time so that Orpheus never meets death. This means Orpheus and Death don't fall in love; Orpheus lives more or less happily ever after with Eurydice. (As side sacrifice is Heurtebise losing Eurydice, too, but he follows his orders.)
I missed entirely any motivation for this. It seems against Death's character for her to make a sacrifice. Any thoughts on why the Princess made this magnanimous, selfless gesture? Did Cocteau just leave that part out?