Philius is aware that people think he’s stupid that people think his darling is cheating on him with Regulus but those people also think he’s crazy that regulus is heartless that his darling is crazy or Weird
Therefore he will stand by the fact that he does not care about their opinions because they don’t see the things he does.
They don’t see the way Regulus will come to pandora after a heartbreak
The way Pandora will wake after a nightmare only to find Regulus already waiting with snacks and a blankets at the Ravenclaw Dormitory door
The way it’s common to see the three in a corner Babying Regulus the way it’s more like a couple with a child then a a man with his wife and his wife’s Boyfriend
The way He more so sees regulus as a son then competition
The way They try their best to include him in everything the way they both are protective of eachother
The way Regulus more and more comes to him for help instead of pandora for things he knows about better
The way some nights him and Pandora will be on the way to the Slytherin dormitory and end up bumping into Regulus on the way
Philius knows that they are Star and Moon to eachother just as Regulus is his son and Pandora his Darling
He knows that they are Star Moon and Sky