* Bam Margera's struggles with addiction and mental health: Bam has been open about his struggles with alcohol and drug addiction, which have negatively impacted his personal and professional life. This likely put a strain on his friendships, including his relationship with Chris.
* Bam's behavior on the set of "Jackass Forever": During the filming of "Jackass Forever," Bam was reportedly difficult to work with, leading to his eventual firing from the project. This incident may have damaged his relationship with Chris, who was also involved in the film.
* Chris's comments on Bam's behavior: Chris has publicly expressed concerns about Bam's well-being and behavior, suggesting that he believes Bam is not taking his health seriously enough. This has likely contributed to the rift between them.
While the exact details of their falling out are not publicly known, it is clear that Bam's struggles have put a strain on his relationships, including the one with Chris.
It is important to note that Bam has been working on getting sober and addressing his mental health issues. It's possible that he and Chris may reconcile in the future, but for now, their relationship seems to be strained.