Frankie could be playing the best game....peace keeper. He was on US BB I think so knows how it works.
Aubrey is the ultimate mean girl, she twists and manipulates. Classic case with Katie. Aubrey went to Katie telling her Frankie thinks shes unstable, with no reason to do so. I think that was to cause friction because it worked. And like Frankie said 'you don't tell an unstable person they are unstable'.
Not sure if it is a bloody good game he is playing or a genuinely peaceful guy, maybe a mix of both. But Aubrey is in no position to make him choose sides. They all have to live together so why not try make it a little enjoyable and not hell on earth. That's his decision, not one for Aubrey to make