Kevin Costner left the TV show "Yellowstone" after five seasons primarily due to a combination of scheduling conflicts, creative differences, and his desire to focus on other projects such as his personal film project "Horizon" and "The Highwaymen." He had made "Yellowstone" a priority but faced challenges like the production not having scripts ready and not reaching an agreement on the show's creative direction. There were also reported tensions over contract terms, including his requests for a pay raise, reduced shooting time, and script approvals, which the show's creator Taylor Sheridan was resistant to. Costner expressed frustration about the way his departure was portrayed in the media and clarified that he intended to continue with the show longer but the circumstances made it unfeasible. Personal factors, such as family considerations and burnout from the demanding show schedule, also contributed to his decision.