I think you were not at fault. The signs before every roundabout indicate what lane you should use in order to leave the roundabout at the three (generally) exits. If you were going 180 degrees around the circle, you could be in either lane. Assuming the other driver entered the roundabout with you, but in the outside lane, that driver should not have expected to have the 'right-of-way' to continue to the third exit.
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