My post that you quoted made sure to explain that it was possible to play it safe...To be fair iv only done one playthrough and the only relationship i had open when the mc became official with nikki was gabi and at that point it was easy enough to close but yea if your banging every single chick then that's on you lol.
Lot's of girls play drama free if you do this, Layla for example, just a fun romp.
So read the posts that you quote next time.Everything in this game(other than picking a single girl and ignoring all the rest) is about "not ending well"