Virgo men tend to have a strong sense of justice and intelligence, so they will likely be negative towards infidelity. They may feel indignant, saying "It's unthinkable to betray a loved one," and feel nervous when imagining being caught cheating.
That being said, while Virgo is quick-witted and adept at maintaining a poker face, they may become repeat offenders once they succeed in cheating even once. They are more likely to be weak when approached by a woman who gives the impression of "I need to help him" rather than someone who aggressively pursues them. Be cautious when he suddenly becomes busy.