man so The Doctor worked hard to make this happen. He's been on the Barbas payroll for AGES because it seemed like the fastest way to get rid of Fitz and improve the quality of his life. He's basically doing that betrayal from the matrix
very like "you know what? My entire existence is a computer simulation and I've had a lot of time to come to terms with the fact that my world isn't real. I've decided I don't care "