Punk is an asshole, I guess. Kinda become more obvious the longer he's been away from WWE.

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More info:
According to the paperwork filed on August 7th by Colt Cabana’s attorney, Punk assured Cabana he would be “100% clear” from any trouble brought on by a lawsuit from Amann including legal fees. Cabana claims that CM Punk failed to keep that promise and he now has unpaid legal bills totaling $513,736. Punk asked Cabana to pay half of the legal fees, which would be $256,868, allegedly saying, “You are on your own.”
“To date I have spent $513,736 dollars on this Amman [sic] lawsuit,” Punk wrote in an email, according to Cabana. “My outstanding current bill is a t least 300k. Half of all this is yours. Divide the 513,736 by 2 and that is what you owe me and what I expect you to pay me. Starting now I will no longer be paying your bills. You are on your own. Whatever my bill is currently, will be cut in half, and half will be yours. If you choose to make this all ugly, that’s fine too. I hope you won’t, but I gave up on you doing what is right a long time ago.”
Although Cabana didn’t betray Punk during the trial, it was said their friendship had a falling-out beforehand. The two spoke to each other during the trial because they were on the same side, but there is still a personal issue between the two former friends.
There were rumors that Punk was upset with Cabana because he went to a WWE show. Punk reportedly felt that he shouldn’t be so friendly with a company responsible for suing them, no matter who Cabana was visiting backstage. Punk and Cabana stopped following each other on social media in September of 2016. On March 10th, 2017, Cabana believes Punk caused his attorney to withdraw as Cabana’s counsel in the Amann lawsuit.
An out of court settlement is still possible in Cabana’s lawsuit against Punk. Dave Meltzer said at this point, Punk and Cabana have spent around $500,000 in legal bills, and regardless of who is responsible for them, neither likely want to.
(Pro Wrestling & MMA World)

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Not sure if this should go here or in other feds, but since this is about a lawsuit which included a WWE physician it seems appropriate.
Sad that money is destroying what seemed to be a really good friendship. But if Cabana still has those text messages and he agreed to it, he'll win as even text messages like that are considered as a legally binding contract.