Why is he convinced that I like his brother?

My friend asked me if I have a crush on his older brother thrice. Each time I denied he kept telling me that I'm not being honest. Why did he ask?
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The thing is I'm now hyper aware because his brother asked such a direct question. So it would be nice to understand the intention behind the question so I could properly plan my next move. I appreciate your input by the way
Why is he convinced that I like his brother?
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