It started in October, when he requested a trade. He was frustrated with Arizona's 1-6 start to the season and with a new defensive scheme.
Then, in May, he was suspended for the first six games of the season after violating the league's performance-enhancing drug policy.
Now, he's publicly displaying his devotion to Arizona.
"I would love to be a Cardinal for life, but you know things happen," Peterson said, via Sirius XM. "Hell, something can change next month. The things happen not only in football, but in the world in general. So, I would love to be a Cardinal for life. I would love to be one of those guys to bring that organization its first championship.
"I love Arizona, I definitely want to be there, just that time of the year last year (when he requested the trade), it was just very, very tough to deal with. But as being one of our leaders, I definitely felt that it shouldn't have gone that way. But people upstairs can trade players and try to shop players around whenever they need to, so I didn't see what was wrong with me asking for a trade at the time. So, it kind of works both ways."
"I mean, honestly, what happened last year, it was a lot of turn of events," Peterson said. "Especially being one game removed from going to the Super Bowl, and getting new coaches, getting a new staff, a new scheme when you're so used to playing in a 3-4 and you felt that it was good for the players you had on your roster, and then it's changed to a 4-3. It was just a lot of whirlwind going on last year.
"But right now, I'm in a very happy place with the team. All of this is behind us right now. Obviously, something new just came up with me being suspended for the first six games. But, you know, I'm a man. I have to be able to lick my wounds and be able to move forward from all of this. I have moved forward and I'm ready to see what the future has to bring for me."