"As his therapist asserts there are rules like none of us can change the flow of time, Britten pauses her stands up and violates all the rules of reality."
This comment makes sense to me. Britten can now violate the rules of time. So I imagine his future realities taking place in different time windows, including the 20 years that the captain spent with the other guy and telling more about their tale and that there was probably much more than heroin involved. Oh man, my mind is running along this track more than I'd like it to.
The number of possibilities are endless. Britten says he doesn't feel satisfied, but there is closure. Perhaps when he solves one "reality" it will lead him to another to solve, repairing his mind piece by piece.
I imagine that Dr. Evans was going to say, before she got cut off, was "If you could end the cycle, by being satisfied with this reality instead of following this seemingly endless roundabout of realities, would you?", tying back to Dr. Lee's saying "Choices have consequences."
So Britten has to choose between becoming static in one reality but never knowing satisfaction (he has his family, or so he thinks, but his detective instincts tell him otherwise), or moving onto new elaborate psyche-realities and progressing toward the truth, risking losing his "repaired" family but eventually knowing true satisfaction at the end goal/reality.