I don't care how she acts with other people, so far Quinn is the only person who's been pretty open and honest with the MC.
She hasn't hid who she or what she does now can you say the same for all the other girls?
I like your message , this is really a good point of view to see where the game could go with next plot.
All main girls actually are hiding something , or are cheating with the protagonist or with somebody , but in every case they had a not clear behavior and for sure they have a gray part of one's life
Josj : from the begin she hided she had a relationship
Maya : she hide to be part of the Hot to the protagonist and she is probably cheating with him
Sage: you cannot trust a girl , that want to make sex in public with her , when she is in a relationship with another person
Isabella and Jill : We don't know so much about them , maybe their friendly relationship could be something more;really strange Isabella reaction when the protagonist see her playing at the piano ; i think that for both characters next episode will be decisive to understand better , who really they are.
So we arrive to Quinn: she his actually the bad girl , involved in prostitution and probably a drug addicted : but since the begin she was true , completely honest with the protagonist, she showed immediately how she was in reality , absolutely honest with him. I don't know if she is really in love with him ( i don't think so ) , but for sure i know that actually she is the only person in the game ( between the main characters ) that could be involved for a possible big twist in the plot ...
In this game i'm beginning to think that not all that at first sight it looks good in the end it is and of course also the contrary ...