And there it is! "MC is not with her in a relationship" exuce. OMG HAHA. Oh man, god bless you.
Alright, let's break it down. She claims they're a couple, and the MC can't even speak up for himself. Yet, she goes ahead and cheats on him, plain and simple. That's textbook NTR, my friend. And as for this "Harem" talk, forget about it. The MC only gets to fool around with a couple of random ghosts, if you can even call it that. Have you seen Mac's Photo selection and the stuff on Luna's Tablet? Trust me, he's got way more content than the MC in the entire game. No delusions here bro.