Would you describe Heathcliff and Cathy's relationship as romantic?
That's romantic with a small 'r' in the sense of passionate love. They are bound to each-other by something profound and also lofty, but I don't know about it being passionately romantic. It makes me think they are (half) brother and sister. Their relationship isn't exactly as romantic as Elizabeth Bennet and Darcy, Margaret Hale and Mr. Thornton, Anna Karenina and Vronsky, Jane Eyre and Rochester etc. Something seems weird about their excess, like tearing them apart is tearing something created in the same womb...i.e something unholy to separate...but unholy to consummate romantically. Just my ideas...what do you think?