What happened in those six months, there were a lot of things that happened but were the past events now colliding with the future?
Was Bella's accusation true and for how long has she known?
Why did she choose to tell Jason when there was nothing he could do realistically?
If the plan was to take the place, they would have done so when Mariam was a no-show as the morale was at an all-time low.
Jason was fed with this new information and with Chronos being the devil on his shoulder, his thoughts adopted a different perspective that he didn't originally have.
Jason was too trusting and this was part of the reason Sam thought he wouldn't last in this new world.
There was no way he wouldn't be eaten alive by those that are ready to do absolutely anything to survive, this included taking a life.
Jason needed to adopt that mentality or he wouldn't last long at this rate.