- But why should she wish to harm you?
- Because I'm in love with her husband.

5 seconds sound clip from the Cat People (1942) movie soundboard.

You can hear this line at 00:54:41.203 in the Blu-ray version of the movie.

Quote context

[...]

- How much do you believe about the cat people?

- The cat people? The story Mrs. Reed told me?

- Yes.

- I believe, my dear Miss Moore, exactly as I told Mrs. Reed...

- The story is a product of her own fear, her own overworked imagination.

- What would you say, Dr. Judd, if I were to tell you that I believe Irena's story?

- Yes?

- Twice I've been followed by something that was not human, something that attempted to take my life. I believe that was the cat form of Irena.

- But why should she wish to harm you?

- Because I'm in love with her husband.

- Oh, my dear Miss Moore. This story grows more and more charming. Simpler, too, all the time.

- You're both victims of fear.

- Mrs. Reed fears the past, and you fear the present.

- Mrs. Reed has a very strong imagination, and you have an equally strong conscience.

[...]