You are an SR fan so I understand you will not be able to understand what the AR fans are feeling on that. Sid knew that AR were engaged. He saw the pictures and he was told the history of their love. Secondly the way he says it, it is pretty obvious that it is meant as an insult to Armaan, Riddhima and their relationship. He doesnt understand it, and his jealousy leaks as acid through his words.
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