Wow. Where to begin Ben? Firstly, Depression Quest isn't aimed at people with depression. It's aimed at giving outsiders a glimpse into what it's like to have depression. Since depression is something that effects people differently, naturally there are going to be some issues with people saying "hey, your experience is different to mine and therefore wrong!"
From what I understand, she has battled with depression. From my experience, depression can be extremely ego driven. In my case, whenever I read something negative about my work, it can send me off into a spiral of self doubt and questioning my self worth - regardless of how harmless or harmful it actually was. This is part of the reason it takes me so fucking long to pump plus 10 damage articles out. This site is pretty good, but the other sites I promote my stuff to? They're venemous as fuck and it can be quite difficult to even put anything out as I question what the point is, and whether what I'm doing is actually valid.
So, it is understandable that she attacked people who attacked her work. These kinds of feelings aren't exactly pleasurable, and lead to a frame of mind that can quite easily lead to aggression.
Secondly, these feelings lead to insecurity, which can be a huge factor in infidelity. I've cheated on a past girlfriend. It was a fucking terrible thing to do, but I did it. The thing was though, that we were in a long distance relationship, at the time I didn't really feel like she wanted to be with me, and I felt like we were drifting apart and had nothing in common. So I hooked up with someone close, more as a validation that I was actually worth something than anything else.
The point is, with infidelity, you don't know the full story. This guy could have been abusive, he could have been an absolute cunt to be around. She could have been put in a compromising situation in a moment of weakness that then escalated and got out of hand. He could also have done everything right and she could be the devil. The point is you don't know.
And finally, I'm a little disappointed by your elitism. It's a text adventure. Text adventures are games, and in fact were some of the first games. How would you feel if I turned around and said "nah, fuck space invaders. It's not really a game because it's not 3D!" Or "nah man, pacman isn't a game because no one dies!" It's nonsense tbh.