"When I wasn't on WrestleMania 35, a few weeks before, I didn't not understand why...I understood plans had changed, I was completely fine with it. I was like, 'what else am I going to do? I can do something else on the show.' They're like, 'Nah. It doesn't fit there, it doesn't fit there. It doesn't make sense.' It was driving me insane. I remember having a talk with Paul Heyman at a show [Raw or SmackDown] near Gorilla (position), and I was losing my mind. 'Paul, I can't believe I'm not on WrestleMania.' He's like, 'I can't believe it either.' 'What do I do?' 'Just walk in there and threaten to quit.' 'No, that's not how I'm going to handle this.' 'If that's how you feel.' It was driving me crazy. I couldn't go to WrestleMania 35. I flew to New York, I had some appearances, and I flew back home to watch it with my wife and kids because I didn't want to be anywhere near it. I flew back the next morning for more appearances," recalled Owens.

https://www.fightful.com/wrestling/kevin-owens-paul-heyman-told-me-threaten-quit-over-not-being-wrestlemania-35