While we still do not have a definite answer as to how long he has been upset with the company, we do know now that CM Punk was already contemplating a departure from WWE as early as Royal Rumble 2014. He vented to Mick Foley at the time about not being happy within the company and having trouble dealing with injuries.
"One time, and this is a true story, we were in South Africa and [Cena] started battle rapping. He started rapping with someone and it was awesome. He went five minutes just talking about things around the room. And we were like, 'Oh my gosh. Where did that come from?' Tommy Dreamer heard it and Tommy took it to Shane McMahon and Shane McMahon heard it and took it to Vince McMahon and next thing you know he's a rapper on TV…and he had already been with us six months or so. Slowly but surely he just became John Cena the superstar."
- Tommy Dreamer telling a backstage story