.。.:*☆ Regulus strongly believed he was better off without his family and their believes in blood purity. That is surely something he had learned while living here in DC. Like, yes, he had cared for them. For them all. But the whole thing, all what the Dark Lord had done.... it had opened Regulus' eyes. And no one would have ever known about it. Or how Regulus had betrayed Voldemort. Because he'd made sure to make Kreacher promise to not tell a soul about it all.
So, yes, Regulus was convinced he was better off on his own at this point. In this strange Muggle city that had brought him back to life, for whatever reason. So, when spotting Sirius of all people in the coffee shop he would frequently visit, Regulus had no idea what to do. His mind spinning, he only stared at his brother why his brain was basically shutting down, as it seemed.