So you don't think like if the next episode comes out, that talking to either one will have an effect on your future with them?
What I noticed is even if you chose to stay with both, there's obviously some resentment still lingering between either of them. I feel like the choice will still have to come at some point. Especially once they find out you've been exploring other girls.
I think that if there are more choices between the two of them like there was in ep 5, that making more in favour of one of them will probably result in a greater likelihood of a solo path with them since you're leaving the other one out a lot, but if you choose an equal number of events with each, then there's a greater chance of a throuple path because you're giving each of them equal time.
When Josy walks in on them in ep 5, it could be seen as resentment, but could also be seen as simply being upset and rightly so. She's been very much left out of this burgeoning relationship with Maya and the MC and I'd say that they're probably closer to each each other than Josy is to the MC, which Josy may think as well, and that Josy may also feel as though Maya is closer to the MC than she is to her right now. So perhaps it's not the MC who feels like a 3rd wheel, but Josy.
As far as other girls are concerned, Maya has essentially given the MC a free pass, why this apparent sharp turn is still unclear, but if he does start openly doing things with other girls and they know about it, then Maya really only has herself to blame if there is any ill feelings there. In this case, Maya seems to be going by that old phrase, "If you love something set it free. If it comes back it’s yours. If not, it was never meant to be."
I agree it is a bad choice. However I think the correct one for the M+J route is to choose Maya. In that moment Maya is upset for obvious (if selfish) reasons. Josy on the other hand had a lovely moment with her father. Maya needs the comfort. Josy doesn’t. The fact that Josy ‘catches‘ you and suggests she wants to join in, while Maya doesn’t find out about Josy And MC on camera is another clue.
I think by the nature of the game we’ll get a bunch more of these type of choices that feel a little forced before then end
If I could give you a

I would but I'm out of reactions for today.

Needless, to say I agree that Maya needed comfort and that's why I chose her on my main playthrough, but the MC really needed to hear what Josy had to say, and that sex scene was one of the best, and it's a shame that it is confined to a choice, but hopefully there will be more solo options later.