That's what you call a game with consquences, choices and narrative, if you wanted a porn slideshow tough luck that's not what I aim to do ^^
You chose to ignore Sasha she went back to her ex, wether or not it is NTR in your mind is mainly irrelevant.
Though to be fair, in most games of this kind, it's better (not necessarily more rewarding but less stressful) to first grind stats and money before you really follow the girls. That doesn't have to be like that, but I can see how some players will be surprised to be asked for a certain amount of speed.
That being said, with seeing her daily and of course texting her and the odd present, it's no problem at all to get Sasha out of the "dangerous" area without even trying or going exclusively for that. It's not like you're forced to play a certain path to love her up.