Simple answer is that you are both in the wrong - if you are going more than half way round a roundabout you should be in the outside lane (i.e. RIGHT in the UK or SA, LEFT in the uncivilised world), if you intend to turn off before the half-way point you stay in the slow lane.
For any exit, when you pass the PREVIOUS one you change lanes from near the centre of the roundabout to near the edge - that sets you upto leave at the right point.
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Overhead, the Albatross hangs motionless upon the air,
And deep beneath the rolling waves,
In labyrinths of Coral Caves,
The Echo of a distant time
Comes willowing across the sand;
And everthing is Green and Submarine
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