When I say that Josy is a problem for the throuple, it's not her fault, it's DPC who decided to put her in that frame of mind at that precise moment.
You're right about the throuple's problem being the Maya-Josy relationship. Josy-MC and Maya-MC are fine, it's between them that things don't work out.
Patrick was a big factor in separating them. Before college, they hadn't seen each other for a while because of him, and initially Josy wasn't into B and R, so their relationship was over. Josy's arrival at college didn't really change things because they couldn't be together. They didn't have a place where they could spend intimate one-on-one time. Even the MC realized this, and arranged a romantic evening for them in his room.
I don't know what DPC has planned, but I hope it doesn't drag on. They talked at Bella's and realized the problem, next episode they spend time together and we get to the resolution: they stay together or they break up.
As for how things will be decided. We've had a few dialogue choices that touch on the Maya-Josy relationship, like the points for Zoey, the Maya-Josy relationship will be saved if the MC said the right thing.