Responses
it's cuz Nadricka saw her as herself & has always been loyal to her (even when she was the Ultra-B*tch from before) while the other dude only saw her as the "past" princess (Ultra-B*tch) who created the harem & slept with any guy she was in the mood to be with.
I'm not actually sure if Nadricka is the confirmed ML though.

In the beginning she didn’t want to have ded with the drunk dude cuz she thought it’ll be disrespectful to be using someone else’s body to have sex but now she did it with Nadricka... I’m so confused. So she likes Nadricka but doesn’t like the other dude (i forgot his name)