Just about everyone in Wuthering Heights suffers physical and emotional trauma, and many of them even die from it. Heathcliff avoids physical illness, but his love for Catherine causes an extraordinary amount of suffering. (He seems to enjoy the suffering, to be fair.)
No one really wants to take responsibility for the misery that results from his or her own foolish decisions—including silly Isabella, who marries Heathcliff knowing he doesn't love her. No suffering surpasses that of Heathcliff and Catherine, and they blame each other. One of the last things Heathcliff says to Catherine, as she lies dying in his arms:
"Misery, and degradation, and death, and nothing that God or Satan could inflict would have parted us, you, of your own will, did it. I have not broken your heart—you have broken it—and in breaking it, you have broken mine." (15.37)
He does have a point there.
Questions About Suffering
Why does Brontë make everyone in love suffer?
Who suffers more, Catherine or Heathcliff—or someone else altogether?
Who are the sympathetic characters in the novel?
Why do so many people become ill?
Chew on This
Suffering is central to Catherine and Heathcliff's expression of love. Without being miserable, their characters would not be as provocative to each other or to the reader.