Dolokhov is obviously still upset about Sonya’s refusal and wants some kind of revenge for Sonya’s feelings for Nikolai. Knowing this, Nikolai still gets sucked into a game with the expert gambler. It’s hard to guess why he lets this happen, but if he is still naïve about Dolokhov’s true nature, his innocence is shattered over the course of the evening. Nikolai knows his family can’t afford such a huge debt, but he continues to rack up debt as if events are beyond his control. As he realizes what he’s done, Nikolai feels like comfortable family life is lost to him forever.