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He would follow the Doctor into anything. He was his life partner, his sun, his stars. He would do anything that would end with the safety of the Doctor, no matter what the cost it was to him.
The Doctor would do the same to the best of his ability, but he had things that he never would be able to break free from, like his moral standards.
When it came to the Doctor, Jamie's morals went out the window. All that mattered was that his Doctor was safe.
And that is where the two of them drew their lines.