Griffon didn't owe Silas anything, at most they just fell in love with the same woman. If there were any misunderstandings or conflicts, it was during the year when he broke up with Taya. But back then, Taya and Silas weren't in a romantic relationship, so when he pursued Taya, it wasn't even considered interfering with someone else's love, let alone taking away.

Later on, Silas wanted to commit suicide, and Griffon saved him, using manpower, resources, and finances to protect him and encourage him to keep living.

When Taya came back, Griffon also chose to support their relationship, even helping him seek revenge and regain his pack's fortune. So...