Since events/scenes are getting recreated with different people inserted in, we are back to either someone dreaming or having their worse nightmare come to life. That could be either Elizabeth, Monica or Patrick. All were exposed to the toxin. All lost people they loved deeply. Elizabeth told Jason during the NOP that you can't let fear dictate your life. She did let fear dictate her life and went for the safe choice rather than what her heart wanted which was to be a family with Jason, Cam and Jake.

When Robin was being held captive, she got to see Patrick, Sabrina and Emma and what their life was like without her and made to believe they forgot about her and moved on with their lives. Wherever Jason is, I wonder if he is being shown what is going on and being lead to believe people have moved on with their lives and he has been forgotten.

thanks GQfan4E for the avatar