Two routes. Go to her apt and it's definitely NTR, trust her and i'm not sure what direction it's going to go cause nothing has really happened yet. It's not your typical blind/stupid MC either. They aren't pretending the MC doesn't know. NTR plays out on public (not hers or the guy she's cheating with) social media posts. Story ends before you find out how MC will proceed. Honestly it's pretty well done. Not the same shit different day NTR trope. I expect if you confront her it'll be the end of the story, but it sounds like it'll be an option. Lots of images of the cheating as it happens too.