Damn, i think i remember talking to her in swipe but i never met her, and i didn't know about the threesome.
And yes, i think you are right with your... Scooby doo example. I mean, some people say that Maya isn't a good option because she lied to the MC, i don't say that it's justified but... In the chapter 6 we see a scene of maya explaining something about her father forbidding her to meet Josy again, we can take that scene as a perfect catalyst for Maya's actions (and also Josy's) during the course of where we did not know they were together, faced with such pressure the two did not know what to do, they were young and... We all make mistakes, so they got carried away when they met the protagonist and it was he who would give them the support they needed... That usually happens a lot. That is why I say, I found a justification in that part, also why I say that you should not judge a book by its cover without really knowing what happened.
Although maybe I'm thinking too much about a game.