Ligeia is considered a Romantic text because Poe rejects society's idea of beauty by pointing out his wife's flaws and features. The story is an emphasis on HIS idea of an aesthetic beauty.
I see. Basically, he is not accepting of society's beauty standards. Another Romantic characteristic in Ligeia is the dark and mysterious nature of the setting.
How upsetting is the ending, right? This couple struggled for ten years to pay for a necklace that turned out to originally be a fake. Had Madame Loisel stuck to her ordinary life, she would not have gon through such hardships.
The Necklace is considered a Realist short story because it has characters that go through a complex and real life scenario. Madame Loisel desires a luxurious life while her husband prefers to settle for an ordinary life.
Although Leigeia is a Romantic text, it could also be seen as a Realist text because of it's characteristic of having characters in a complex situation that involves ordinary animals (parts of nature) we would see in real life.
I can see that. I would counter argue that The Necklace can also be seen as a Romantic text because of it's characteristic of having the couple go through intense emotions like guilt and humiliation.