Can't quite agree honestly. Momoka is completely free to do whatever she wants and Rin has never had a positive attitude towards her since the beginning of the series. Sure she screwed up at the hotel part but Rin made it clear that but she never showed any kind of actually "loving" Momoka and assumed she just wanted to have sex with her.
I can agree they are both in the wrong, but when someone behaves like Rin you can't just expect people to like you and tolerate your stuff. If anything instead of accepting being Momoka's partner, she should have sat down with her and have a talk on what the hell is going on (but there would be no story then lmao)
Still, #momoladidnothingwrong