Orpheus looks back to see if Eurydice was following him because she didnt respond to Orpheus and he is making sure that his beloved was still on his side. But, forgetting the condition of the gods that he must only look at her when they reach the earth, Eurydice was sent back to the underworld. Orpheus was so sad that he wandered the earth alone, playing his sad songs to the trees hoping that he and Eurydice would once again be reunited.
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