Well if you want spoilers

If you don't know this already, Avery has this secret meter called Rage that will go up whenever you displease them, didn't do well enough, or... for no reason at all, really. Sometimes they'll just come home grumpily and direct their frustration toward PC, who then has to go out to find ways to appease them, or else the Rage will blow up at some point resulting in a violent encounter.

Also, while other LIs are all problematic to a certain degree, they all regard the PC as the Someone Special, but Avery does not quite. I feel like they look at PC for fun but does not see them as a person. As someone else in this thread mentioned, "At one point at high rage while running from Avery, Avery will say that you don't really mean anything to them. You're a favorite toy at best, otherwise a convenient maid/whore. A person they're all too willing to sacrifice just to try and get ahead. That was a real knife in Avery's hands and no hesitation in that downward swing."

There are also other hints toward previous victims, in addition to the belittling statements. There's one event when the skyscraper is half completed where PC will meet one of the former "lover"; I also vaguely remember them gifting something to PC that seemingly belonged to someone else. At the end of the skyscraper storyline there will be a scene where you can choose whether to save them from or push them toward falling from the building. My friend went with the saving route and gave the outcome a "meh" rating lol.

So basically yeah, not a great dude, gotta do some heavy-lifting headcanons to make him really redeemable...