I wrote this before a few times, but with the risk of being labeled sexist, here I go again.Yea I know she's unique but "her" brain is totally screwed up alright. I love your game and haven't complained until now. It was too bizarre to let go of. I usually don't care, I mean these games are what they are, fantasy, so why waste any emotions and time on them more than maybe erotic ones lol. It would have been okay if Lily just got curious and not angry at Nick....well maybe a little bit jealous too since she seem to think that only she can screw around in this marriage. But hey, you have your artistic freedom to do whatever pops up in your brain. I just try to point out that the narrative is very important for the whole picture or it will make things bizarre.
Logically, analytically and rationally you are 100% right that cheating etc should be judged symmetrically between females and males. However, the honest truth is that games (Lily) is is not the only place this so called "equal judgment" works "asymmetrically". Many women in real life see things very asymmetrically - what's ok for her to do, is not ok for you to do... get used to it.
P and P is of course taking this to an extreme but they are not totally off.