On the 50th edition of the "Talk is Jericho" podcast, hosted by former WWE star and current Fozzy front man Chris Jericho, Paul Heyman made an appearance.  Jericho asked Heyman about CM Punk departing from WWE, and Heyman gave an inside response.  Heyman said the only thing that surprised him was that Punk lasted as long as he did.  Here's an excerpt of Heyman's comments:

"He was unhappy.  He had enough.  He couldn't take it anymore.... A year before he walked, there was daily conversations of 'I don't think I'm going to be able to take this.  I'm not sure how much longer I'm going to be here.  I don't know how much longer it's going to be before I just decide to go home.'  I'm surprised it lasted that long...

"Every day with him was an exercise in him finding the balance to simply continue on and find the passion that he needed to do it.  And I think what happened was he walked in the day after the Royal Rumble and he couldn't find that passion.  He couldn't convince himself or persuade himself, 'OK, whether I'm happy or not this is about the performance, my legacy.  It's about I take pride in what I do.  And whether I'm happy or unhappy, when I go out there I'm going to be the best CM Punk I can be.'  And I think somewhere during that day he couldn't find that."

I know there were times toward the end of Punk's run where I made mention that he wasn't on his game.  In past editorials, I noted that it seemed Punk had lost his passion and was going through the motions.  Perhaps what Heyman is saying is truth, and indeed it was just best that if Punk couldn't do this with passion that he just walk away.  Hall of Famer Edge also chimed in on this conversation as well.  It's a good listen, and I highly recommend the entire interview.