This is a question involving technicalities in contract law, consideration, human rights and property law. It is axiomatic to recognize the fact that Peter has a legal obligation not to follow Mary deliberately (and she would almost be sure of invoking such a defence), but her request for him not to stay in the same city could be viewed as way above that obligation and thus if Peter does go to the extent of moving away from the city, he could very well have given to her a practical benefit sufficient enough to effect consideration.
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Sarah
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