I take from this that Azuran's love was actually much stronger (or more intense) than Yuri's and she felt that if she stayed, it would end in a disaster for Yuri.
She had to leave to protect Yuri. In some societies, marrying girls off to nearby villages is the normal thing to do. Two lesbians eloping wouldn't go far.
But she couldn't bear to leave without a piece of her.
Dramatic, but beautiful.
Thanks for the translation.