Robbie Williams’ former songwriting partner Guy Chambers has opened up about his relationship with Williams in a new interview, where he described the pop star as having “a self-destructive side”.In a new interview with The Times, Chambers spoke about struggling with Williams’ addictions in the ’90s saying “he was the first person I worked with long-term who was in full-blown addiction, and I wasn’t prepared for that. It was very difficult.”He claimed: “We’d wait three days for him to turn up at a studio.