Luna watched Neville quietly for a moment before nodding. "You are jealous?" She didn't think she'd ever felt that before. She wasn't sure why you would feel it. "What has made you jealous of Rolf?" Because that was the only person she could think of him meaning. He hadn't been jealous of Ginny or Harry or any of the others for being her friend.
"I have other friends," she noted quietly. "Have you been jealous of them, too?" She hoped not. That would be very confusing. Jealousy seemed like a very confusing thing. Perhaps Jealousy attracted Wrackspurts. She would have to talk to her father about that possibility.