Draco did feel somewhat odd about leaving Neville and Harry, feeling that it was making the difference between Neville’s old and new friends all the more stark. It wasn’t that Neville made Draco feel unwelcome, Draco sincerely doubted that Neville would even know how, but he definitely felt that he didn’t fit in together with the two old friends and thus had decided to retreat for his own sanity.<br/>It was probably a childish way to react, just avoiding Potter at all costs and being adamant about not being seen around him. He feared that other people would call his bluff, would realise that maybe he wasn’t that good of a person after all and that this had been for nothing.<br/>In that sense, it seemed better to just keep at a distance and not allow himself to be compared, even if it also meant retreating from Neville.