I doubt that's the case. During the earlier part of the movie, the Man spends a day and night watching the camp before he ventures in to take the battery, so he saw the little guy get released from the trunk to fetch water and knew who the Boss was and where everyone slept.
Given that earlier in the movie we're introduced to the idea that women are the prized possessions of the clever or powerful, the woman revealed right at the end of the movie would've likely been owned for a long time and the Boss kept such a strict control to maintain his dominance and right to use her whenever he liked.
We realise this when, at the end, the Man laughs to himself as he realises that the Boss was ultimately only doing the same thing as the Doctor, and even the woman smiles at the ridiculousness of her predicament and life under the circumstances. What the Man does as a result of this revelation is anybody's guess, because the movie ends there and lets us make up our own minds.