Punk told everyone in his documentary that he saved money,and would have no problem leaving wrestling.
Just going by his documentary,his interviews he isn't the type to get sentimental on some "I should leave on good terms" type of shyt. I'm sure he won't even talk about why he left as well...he's one of those celebs who don't want to be treated like one.
As a Bryan fan, thinking Punk left because of Bryan is just

...Punk is confident as fukk....dude wasn't threatened by Bryan at all. Going from the wrestlers,and even reports before he left. Punk was hurt alot,most likely had something to do with it.
I just hope he says why he left so some of these pathetic Punk marks can stop trolling the show with Punk chants because they think WWE did him dirty.