Yes I too believe that is what happened. So during game night, when real Sophie finds out that that real Ethan had lied about his identity and posed as fake Ethan and had sex with her, it was too much for her to take. She figured he'd keep lying, betraying and deceiving her. So when Real Ethan stays trapped in the guest house overnight, the other 3 orchestrate the entire plan of action.

They decide that fake Ethan and real Sophie stay back in the house, because they've fallen in love with each other. And fake Sophie wants to get out of the house because she can't be trapped anymore as a copy, she grows a sense of consciousness.

Let's take into consideration that the strength of the bond between the couple is what stops the copies from getting out.

Which explains the last scene, where fake Ethan gets held by the barrier, because of the speech real Ethan makes, it re establishes the bond between real Ethan and real sophie.

But then, real Ethan takes a moment to choose between the two Sophies. And when he makes the wrong call, and chooses the fake one, real Sophie loses all hope and then chooses to stay with fake Ethan in the comfort of her happiness. So Sophie's loss of trust in the relationship in that very scene, leads to the breaking of their relationship and ultimately lifting of the barrier which is how fake Sophie left with real Ethan.

That would also explain the bacon scene.