Sergius is the epitome of what every romantic hero should be: He is dashing, swashbuckling, devastatingly handsome, idealistic, wealthy, aristocratic, brave, and the acclaimed hero of a recent crushing victory in a recent cavalry raid which he led. He is possessed of only the loftiest and most noble ideals concerning war, romance, and chivalry, and he represents the quintessence of what a noble Bulgarian aristocrat should be. Yet Sergius is more than this. He is an aristocrat, but he is a Byronic type who has certain ideals, and he is likely to become thoroughly disillusioned when these ideals fail. For example, Sergius did go to war filled with high ideals, and he did lead a heroic and courageous cavalry attack; later, however, he discovered that wars are not conducted by bravery and courage; they are more often waged and won better by efficient and practical planning than they are won by glorious and chivalric deeds. For Sergius, then, war is only fit for sons of hotel keepers, who have something of the tradesman about them. For that reason, Sergius has resigned from the army in complete disillusionment.
After having become cynical about soldiering, Sergius becomes skeptical about his relationship with Raina. After all, as he tells Louka, it is rather tiresome having to live up to Raina's "ideal of the higher love." It was he, however, who placed Raina on a pedestal so high, in fact, that he was blinded to any possible fault she might have. When Louka reveals all of Raina's faults — Raina lies, she pretends, and she has entertained another man in her bedroom — Sergius then feels free to cast his affections where they normally lead him — into marriage with the attractive Louka.