Why were his friends looking over at us while we talked?

I was talking with my guy friend and I noticed from across the room that a few of his friends were looking at us. From other occurrences, I do have reason to believe that he sees me as more than a friend. But I’m just curious as to why his friends were looking. I don’t think that he noticed it. Did he tell them something?
Why were his friends looking over at us while we talked?
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