Emmanuel Petit made the controversial decision to leave Arsenal for Chelsea in 2001, but his time at Stamford Bridge was far from enjoyable as his club career fizzled out
The main conceptual idea is that Emmanuel Petit deeply regrets leaving Arsenal for Chelsea in 2001. He describes his time at Chelsea as unpleasant and expresses disgust with the club, suggesting his move was a significant mistake that he continues to regret.
essentially: He made a big mistake joining Chelsea.