I shouldn't think Billy would mind, really.
4 seconds sound clip from the Beat the Devil (1953) movie soundboard.
You can hear this line at 00:42:35 in the Blu-ray version of the movie.
Quote context
[...]
- That's right. Threaten me. It is not enough that you destroy my beautiful car, now you will...
- Stop!
- More than anything, I want Billy to make a grand success out there.
- Ah, as you care so much about money,
- I should have thought you would have left Billy for some rich man.
- I shouldn't think Billy would mind, really.
- I mean, neither of you are in love or anything.
- Of course I love Billy. Actually, I adore him.
- And Billy loves me very, very, but, very much.
- That's why I trust him with his little unimportant amours.
[...]