She's with Slim.

2 seconds sound clip from the Criss Cross (1949) movie soundboard.

You can hear this line at 01:12:13.125 in the DVD version of the movie.

Quote context

[...]

- But if she's on the level with you, if she double-crossed Slim, if she's really waiting for you somewhere, then he'll get you. Never forget that.

- You see that door? He'll send a gunman for you right here in the hospital, right through that door. And he'll get you!

- Get out! You got nothin' on me. You can't prove a thing.

- So you still think I'm wrong, huh?

- What do you want me to do? Put a pair of police guards outside the door?

- She's with Slim.

- Get out!

- I should've been a better friend. I should've stopped you. I should've grabbed you by the neck. I should've kicked your teeth in.

- I'm sorry, Steve. I'm sorry.

- Well, here we are, Mr. Thompson. How are you coming along? Going to go dancing with your arm up in the air like that?

[...]