Jonathan reached Moon-Valley within minutes of traveling in his wolf form. He could already smell Greggory everywhere and on every female. It was disgusting what he was doing to Jessica. That bruise on her neck was done by Greggory; there was no doubt in his mind about that. The fact that he’s an Alpha, and like Rock, uses his force to hurt his luna.
Greggory was somebody that Jonathan had once trusted; he thought of Greggory as a friend at one point. Back when Arina resided in Moon-Valley and attended their art school, he befriended Greggory. He was just a young boy who wanted to have a good time but couldn’t because he had so many responsibilities. He couldn’t truly be a kid.
Even after Jonathan’s 18th birthday, when he found out that his mate was Arina and he couldn’t hang around her anymore, he remained close to Greggory.