I think he was also a metaphor or a religious symbol. Teaching the couple about life, love and death.
He seems a very simple man who has obviously been on his own for a long time. At one point he refers to himself as "beloved son" and there is something child like about him.
It's as if he's their son, but also their teacher. And it does feel as if the 2 are reborn as well.
So all in all rather confusing!
In a literal sense, I would say he is possibly the last survivor of the outside City. Although of course there could be others scattered about!
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