The Mexican-American took responsibility for failing to dedicate himself and coming in overweight before his rematch defeat to Anthony Joshua last month, and will now be changing preparations as he attempts a comeback.
Robles told ESPN of the split and said: “I’ve seen it coming, I’ll be honest with you. Andy was just doing whatever the hell he wanted to do. The dad, obviously with him being the manager, he just had no control over his son. None of us had control of him, for that matter.
“So I just saw it coming, it wasn’t going to work because he wasn’t listening. He’s not listening to me, he’s not listening to his dad, he’s not listening to anybody. He said it himself after the [post-fight] press conference.
“Fortunately for me, Andy took the blame on himself and didn’t sit there like a majority of fighters and blame the coach.”
Robles also said he was told by Ruiz’s father that it was advisor Al Haymon’s decision to replace him.
“They apparently told them that they didn’t want the same thing to repeat itself again,” Robles added.
“It is what it is, I don’t know what to tell you. It’s not the first time it’s happened to me.
“I’m sure it’s not the first time it’s happened to other coaches. It happens time and time again. We always end up getting the short end of the stick. But it is what it is, you keep moving forward.”
“I’m absolutely grateful and blessed to have been able to experience everything that I was able to experience in 2019
“I mean, we made history, and I have to be thankful for that.
“I have to be thankful to Andy and his dad for giving me the opportunity to be part of something special, to have made history – for him to become the first Mexican heavyweight champion of the world.”
The split will come as a shock to many, given what was said at the post-fight press conference on December 7.
Ruiz Jr apologised to Robles for not listening to him in camp and the trainer returned the favour, promising to stick by him in future.
Eddie Hearn has recently made contact with the Ruiz camp and is in talks for a potential bout between him and Dillian Whyte next.