Selkie stories are quietly the most brutal romances in folklore. A seal-woman comes ashore, sheds her skin, a fisherman hides it, and she has no choice but to stay. She marries him. Has his children. Seems content for years.
Then one day she finds the skin. And every version agrees: she walks back into the sea and doesn't look back.
Nobody telling those stories calls it a love story. It's about what happens when the only reason someone stays is that you hid the door.