Every time you kiss him, his heart breaks with rage that it's not Cathy.
5 seconds sound clip from the Wuthering Heights (1939)) classic radio play.
You can hear this line at 00:43:05 in the radio play.
Quote context
[...]
- If Cathy dies, I might begin to live.
- Ahhh. Begin to live? Ha! In this house with Heathcliff, nothing can live.
- So you think you'll begin to live, when Cathy dies? You won't.
- Oh, what is it? This house! I can feel the hate within it, like a crushing weight.
- And you! He hates you even more than he does me.
- Stop it!
- Every time you kiss him, his heart breaks with rage that it's not Cathy.
- Isabella, why don't you do what I've been too weak to do? Kill him.
- While there's still time to save your immortal soul.
- Well! Remarkable. Really, the first coherent speech I've heard from you in weeks.
- Please don't. I tried to stop him.
[...]