Kid Cudi says he hated every minute of his time on the witness stand in Diddy's federal criminal trial ... but he ultimately went through with testifying because he wanted to support his ex, Cassie Ventura.

Kid Cudi – whose real name is Scott Mescudi – was called upon to testify against Sean Combs in late May 2025. Years ago, Mescudi was apparently involved in a brief romantic relationship with the aforementioned Cassie.

Kid Cudi has opened up about his experience testifying against Sean "Diddy" Combs, calling the ordeal "really hard" but insisting that he still believes it was the right thing to do. In honor of his new book,