On what page does vesper betray bond in casino royale?

In "Casino Royale," Vesper Lynd betrays James Bond in a pivotal moment towards the climax of the story. This betrayal is revealed after Bond has already developed strong feelings for her. The exact page number may vary depending on the edition of the book, but the betrayal is a key plot point that occurs during the later chapters, around pages 150-200 in most editions.