Regulus was hardly in the position to throw stones since he had been careful with both Harry and Gaius because he hadn't wanted to risk falling out with Sirius, but he looked mildly disapproving nonetheless.
"Don't forget your own feelings in all of this," he said. "You've been through a lot yourself, and you deserve to be happy - or at least not lonely and miserable - just as much as he does." He glanced over at Gaius and winked. "Then again, perhaps being happily committed brings out my inner cupid and makes me want to see everyone else blissful and shagging."