The MC,
Sure he isn't doing anything wrong (we'll just ignore the whole compensated dating/prostitution angle), and his current "girlfriend" is forcing him into dating her or something so that absolves him from treating her like crap I guess (why is she even a factor here?). Next he worships his ex who treated him like crap and now is seemingly mad he isn't more unhappy like some sort of sociopath. He also worships the girl who is milking him dry of his money and charges him to talk to her. She didn't this time, even if it was only because she needed a favor, progress though! They are hot though as he says, so okay I guess.
Honestly, the thing is, the guy is just some sort of insert for the author to express how hot the female characters are. He really is just one of those shallow, pervy, ogling background characters saying "omg she's so hot *drool* " but with more dialog. The MC just goes between being forced into things and having fantasies about the girls, over and over.