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blazing_boz: That's my understanding of it at least.
Although after looking back into the chapters, this guy seem to not be a butler, but rather THE financial experts they hired to cover her screw up (ch 3).
The conversation you're thinking of is in ch 3, which is him telling her the duke won't hear about it.
So I think the point that he's hired to cover up her mistakes so that it doesn't affect the duke should remain valid.
As for him being nice to her...well, in a way she's the reason he's hired....or just him being professional and act cordial to gain her trust, this way she'd actually consult him first before trying something.
As for the lack of knowledge of Chloe's harassment. I think it's fine to consider that as various sectors of the house rarely contact each other, and when done usually through those in higher positions.
And most of the ones around Chloe's are harassing her so obviously none of them would report this (even the head maid was one of her harassers)
If we look back into the early chapters, the kitchen staffs and the knights didn't have such cold attitude towards her (except this one girl, for the reason shown here), if anything they're more...curious? and very few expressed surprise at how Chloe's changed.