How did this happen? Was he really just pretending this whole time?

But from beginning. You and Aris knew since Group B. Somehow, it turned out that you became a couple, despite your initial dislike for each other.

Later, when WICKED "helped" survivors escape, in Janson's facility you both met Thomas, Newt, Minho, Frypan, Teresa, and the rest. Blah blah, it turned out that WICKED are antagonists, you escaped WICKED and so on.

All this time Aris, your boyfriend, was by your side and helping you in your moments of weakness.

Yet, later, Thomas discovered that Teresa had betrayed you and called WICKED to your location. He ran to warn rest, but it was too late.

But that wasn't the worst.

The worst thing was that once WICKED surrounded you all, Aris went to their side. You understood too quickly. So he cooperated with them from the beginning, leading you into a trap.

He just gave you a short look that showed various emotions for a second, but it disappeared as quickly as it appeared and you weren't sure if you weren't imagining it.