The Dalek Invasion of Earth - S2-E2
Question: Why did The Doctor leave Susan?
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Chosen answer: The Doctor left Susan because she fell in love with a human who had asked her to marry him. The Doctor probably thought that it was better for Susan to stay in one place rather than travelling all over the cosmos with him.
Agent Angel
He does explain if you listen to the speech he gives that the end of the episode as he leaves.
Dan23