Why does the dark-haired girl around suspicion in Winston?

The dark-haired girl arouses suspicion in Winston because he perceives her as a potential Party operative, particularly due to her boldness in approaching him and her seemingly subversive actions. He is wary of her intentions and questions whether her flirtations are genuine or part of an elaborate trap to monitor dissent. Additionally, Winston's internal conflict and paranoia about the Party's surveillance amplify his distrust, making him cautious about forming any connections. Ultimately, his fear of betrayal and the oppressive nature of the regime fuel his suspicion.