Kid Cudi's relationship with Sean 'Diddy' Combs and Cassie, explained

Kid Cudi dated Cassie during a break in her relationship with Diddy. Aurore Marechal / ABACAPRESS.COM / Emma McIntyre / Getty Images / Richard Shotwell / Invision / AP Kid Cudi testified at Sean "Diddy" Combs' trial on Thursday. Kid Cudi hasn't released music with Diddy, but dated his ex, Cassie…