And now young Ashenden is upset Rosie isn’t just having an affair with him, but with other fellows as well. Possibly. The extent of her affairs is unclear. Most of the chapter is just young Ashenden getting all worked up about it and being annoying and Maugham not really accounting for the distance between old Ashenden the narrator and young Ashenden’s activities. It’s frustrating more than anything else, just because it’s something of a wasted chapter. Maugham could’ve just as easily summarized the whining as getting into it all—it’s not dialogue, it’s just young Ashenden’s thoughts (or old Ashenden’s memories of them).