Some people are more prone to cheat than others. We've all heard the phrase “once a cheater, always a cheater”, which reflects traits associated with one person. Individual factors can include personal values, moral compass, empathy, and impulsivity. Recognize if you knew that your girlfriend has cheated before or has a reputation of cheating. She may be a “serial cheater”. If she is angry at you for something in the relationship, she may use sex or cheating to get revenge. Your  girlfriend may cheat on you to get back at you for something, or to intentionally cause you pain. Ask your girlfriend whether the cheating was used for revenge or to make a point. Sometimes people who would normally not cheat end up cheating. This can be due to environmental factors such as being around many attractive people, or having a job that involves touching or one-on-one discussions with people. A partner can be very happy in a relationship, yet get caught up in a situation against better judgment. Ask your girlfriend what happened. She may be willing to say she got caught up in a situation. This can be especially true if you believe the relationship to be happy and she does too. Remember that people do make mistakes, this just happens to be a very large one. Some people use alcohol to escape their problems. For others, it may be too painful to confront problems (either individual or relationship problems) and may instead escape through other methods, like cheating. Instead of facing problems, she may use the thrill of cheating to feel better, while not fully considering the consequences. Ask about the problems your partner is facing, and if the problems can be worked through together. Ask her if there are things she wants to say or express that she feels shame or embarrassment in bringing up. Some people stay with a partner to feel supported or loved, yet have difficulty letting go when they realize they are not in love. Your girlfriend may have realized that she was not in love, but stayed to get certain needs met. Or, her...

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