You can't. He's not a man. He's something horrible and dark to live with.
7 seconds sound clip from the Wuthering Heights (1939)) classic radio play.
You can hear this line at 00:36:41 in the radio play.
Quote context
[...]
- So that's what you mean. It's you who are vain and foolish, Cathy.
- Heathcliff's in love with me.
- It's not a lie. He told me so.
- He's kissed me. Yes, kissed me. Held me in his arms. Told me he loves me.
- Oh! I'm going to your brother.
- Tell him Heathcliff asked me to marry him. And that I've said yes. You hear? Yes!
- You can't. He's not a man. He's something horrible and dark to live with.
- I know why you say these things. Because you love him.
- Yes, you do love him. You're mad with pain and jealousy at the thought of my marrying him.
[...]