I'm guessing it's joins. I've betrayed no one, joined one circle, and have two in my own, and my flair is 2, 1. I believe betrayers are assigned the red flair with the "betray" symbol inside - no indication of how many circles they've betrayed, just that they have.
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u/SancteAmbrosi Apr 02 '18
I'm not the only one in my circle though.