How we cite our quotes:
"Have you considered how you'll bear the separation, and how he'll bear to be quite deserted in the world?" (9.98)
Catherine can hardly think beyond her own desires. Nelly makes a futile attempt to defend Heathcliff here. She knows that if Catherine marries Edgar, it isn't going to be pretty.
There was another rapid glance at the house, and supposing himself unseen, the scoundrel had the impudence to embrace her.
"Judas! Traitor!" I ejaculated. "You are a hypocrite, too, are you? A deliberate deceiver."
"Who is, Nelly?" said Catherine's voice at my elbow: I had been over-intent on watching the pair outside to mark her entrance.
"Your worthless friend!" I answered, warmly, "the sneaking rascal yonder. Ah, he has caught a glimpse of us – he is coming in! I wonder will he have the heart to find a plausible excuse for making love to Miss, when he told you he hated her?" (11.36-39)
Heathcliff's plot against Edgar begins, and Isabella becomes his willing dupe. Nelly doesn't exactly maintain calm in the situation. Look at her language – she clearly wants to provoke Catherine. And who exactly is the other hypocrite to which she refers here?
"What is it to you?" he growled. "I have a right to kiss her, if she chooses, and you have no right to object. I am not your husband: you needn't be jealous of me!" (11.45)
Just because Heathcliff's not her husband doesn't mean Catherine won't act jealous and possessive of him. In this moment, it's hard not to be on Heathcliff's side.