Well, I heard differently.
5 seconds sound clip from the The Exorcist movie soundboard.
You can hear this line at 00:25:31 in the Blu-ray version of the movie.
Quote context
[...]
- Don't be silly. Of course not. Where did you ever get an idea like that?
- But you like him. Of course I like him. I like pizzas too, but I'm not gonna marry one.
- You don't like him like Daddy?
- Regan, I love your daddy. I'll always love your daddy, honey. Okay?
- Burke just comes around here a lot, because... well, he's lonely. He don't got nothing to do.
- Oh, you did? What did you hear, huh?
- I don't know. I just thought.
- Well, you didn't think so good.
[...]