You give way to the right at roundabouts. That is a known and established fact. Your description puts you firmly in the wrong.
Read it again, grasshopper.
I've read it twice and don't get it. He was on your right and turning right, you were going straight on. Why was he in the way?
I think I might need a diagram.
I read it again, cricket. Still don't make sense.
@Sharkstar started
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You give way to the right at roundabouts. That is a known and established fact.
Your description puts you firmly in the wrong.