The progression from yandere to cockslut in the tech demo Is done poorly, 3 events and she forsake the mc just because She smellled the old bastard cock lol, i'm pretty sure that the full game will take more time to show her changeWell, there's a part in the dungeon where you implied you did something with another girl and the priestess does beat you up until you end up with 1 hp. That was only implying so I can't imagine if she actually caught you in the act.
Also, I find it contradicting that the priestess is considered a yandere and yet she's willing to fuck other men.