- Nothing petty about David, but I don't intend to tell him.
- No, don't tell David.

4 seconds sound clip from the The Picture of Dorian Gray movie soundboard.

You can hear this line at 00:59:37.590 in the Blu-ray version of the movie.

Quote context

[...]

- Goodbye, Dorian. I'm looking forward to your party tonight. I'm sure it will be wonderful. Your parties always are.

- I'm not really as lovely as that picture, am I, darling?

- Of course not.

- I think I've discovered why Dorian hasn't proposed to me. And I've decided what to do about it.

- And what have you decided to do about it?

- I'm going to ask him to marry me, tonight, perhaps.

- What about David Stone? You think he'd take you to Dorian's party tonight if he knew what your intentions were?

- Of course he would.

- Nothing petty about David, but I don't intend to tell him.

- No, don't tell David.

- David, you cad. I never thought you'd be an eavesdropper.

- Don't be alarmed about Dorian Gray. I'm the one Gladys will marry.

- Of course, I have nothing to say about it.

- Even if you weren't going to marry me, I wouldn't let you marry that devil.

[...]