When visiting Anthony at the office she can listen before entering, picking the "hear dirty talk" option. That unlocks a choice when Anthony confronts her back home. Her rebuttal is that she heard the dirty talk and doesn't believe his excuse of Kimberley blackmailing him. He then smacks her ("busted lip" choice) which puts Myriam back in a docile state (as game says) while she's on the floor. By doing these choices it doesn't match the party choices where she's doing it for Anthony. In reality she's doing it because she's scared of him - he was always abusive but (far as I know) only during sex. I don't know. I wish it would be better reflected that she's scared of him if picking those choices rather than "I'll do it for Anthony because I messed up" when she knows she didn't.
I'm being critical because lowkey Anthony/Myriam is one of my favorite story arcs so far (yet to see beyond chapter 3-4).
Yeah, but your missing the point, that Anthony has progessively brainwashed her into believing that everything is her fault. Whether she's scared of him or not, she still believes what he says is true, because he's conditioned her to react that way. Everytime he abuses her, she thanks him for it. Because he's made her believe that she's just a dumb whore, and pleasing him everyway he wants is her duty as a partner.
When the game starts Myriam is a pretty naive and trusting person, and Anthony exploits that. He's chosen to be with Myriam for a reason. Because he understands her weakness, and is taking advantage of it. So when you say that she knows she didn't mess up, that's not totally correct, because as soon as Anthony contradicts her, she immediately backs down. Because on that route, she really believes that Anthony knows her, better than she knows herself. That's why she lets him abuse her, over and over again, and she fails to see Anthony for the bastard he is ( both Katherine and Evelyn repeatedly tell her this, but she always comes up with excuses for Anthony).
By the time the party happens, she's visited Doctor Silver, who has forced her to start questioning Anthony's true motives, and she's begun the process of sexual liberation, which is starting to make her view her life differently. So after the party she now has doubts about Anthony and she's more open to the possibility of change. The question is, does she start believing her own instincts or does she continue ignoring them, as Anthony has progressively conditioned her to do? That's the choice she's faced with, when Kimberley turns up and tells her the truth. As it stands she chooses the former, and the game carries on, because Myriam chooses to believe in herself for the first time.
At this point, outside of the bad ending, it's hard to see the Myriam/Anthony story arc developing beyond Anthony's next appearance in court. Which barring some dramatic escape from custody, is likely to end up with a very long prison sentence for him. Marc's custody case is now also pretty much done and dusted. Myriam is effectively his legal guardian, and it only requires confirmation of Anthony's guilt for attempted murder, to take away any lingering rights he has regarding Marc. By the time Anthony gets out of jail, Marc will be a middle-aged man. So his poisonous influence over him, is thankfully gone for good.