I've seen sometimes where a pair will mate, but one of them will be elderly and slow, and by the time they reach the hut, the other one has already been there and left. So they will still go in by themselves, but the female will come out with the baby. As to the running away part when there was no attempt from another villager to breed, I'm not sure.
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"Hope is the feeling you have that the feeling you have isn't permanent."
-Jean Kerr