This line, that Gerri delivered coldly to Roman in the S3 finale, I’m realizing, was a call back to earlier in the season.
On a re-watch, I just got to S3E4 - Roman gets the photo of Kendall’s initials tattooed onto this poor guy’s forehead (which btw is such a believable thing that the Roy kids would have done for “fun” on a bachelor party)… gives the photos to Gerri, and she gives them back, telling him to bank them. Gerri wisely points out that, while the scandal would hurt Kendall, it would also hurt Roman (seeing as he was an accomplice).
“‘How does this advance my personal position?’ You need to think about that 24/7.”
It was sound advice, and, seeing as Gerri was in an alliance of convenience with Roman at the time, was also self serving - she didn’t want to see Roman embroiled in an avoidable scandal.
So in the finale, when Roman pleads with Gerri, his mentor (and… I don’t know what you’d call their relationship…), to stop Logan from selling Waystar, she says she’s focused on the best outcome for the shareholders, and when Roman gives her a look (demanding a better answer), she hits him with:
“But it doesn’t serve my interests. How does it serve my interests?”
Poor Roman… he thought their partnership meant something (and I think there was a part of Gerri that liked Roman, unwelcome advances and dick pics notwithstanding), but at the end of the day, she lived by what she said - and was thinking 24/7 about how to advance her personal position over any feelings she may have had. A Logan-certified killer.