The main cause of betrayal by girls is just selfishness. Slot of times it is from  Selfish motives: One of the most common reasons for betrayal is self-interest. Girls may betray others to gain power, money, or attention. They may also betray others to avoid consequences or protect themselves from harm.

Anothrt reason could be that of Emotional starvation whether the affair is physical or emotional in nature, a woman may cheat because she craves conversation, empathy, respect, devotion, adoration, support, or some other connection

First, a few common reasons why people betray another person: Selfish motives: One of the most common reasons for betrayal is self-interest. People may betray others to gain power, money, or attention. They may also betray others to avoid consequences or protect themselves from harm.