Frustration: When someone is upset or angry, they may become frustrated with what they perceive as evasive or disingenuous responses. Saying "don't play dumb" could be a way of expressing that frustration and a desire for more direct communication.
Perceived Lack of Honesty: Your girlfriend might feel that you are not being sincere or honest in your responses, leading her to use that phrase to express her suspicions or disappointment.
Emotional Reactivity: In heated moments, people might say things they don't necessarily mean or use phrases to push emotional buttons. It could be a reaction to feeling hurt or unheard during the argument.
Desire for Validation: During a disagreement, emotions can run high, and individuals might want their feelings and concerns acknowledged. If your girlfriend feels like you are not taking her seriously or not listening, she may become more forceful in her communication.
Past Communication Patterns: If similar situations have occurred in the past, your girlfriend may feel like you are repeating patterns of behavior, leading her to react more strongly.
However, it's important to remember that communication in a relationship should be respectful and understanding. Using rude or hurtful language during arguments can be damaging and counterproductive to resolving issues. If your girlfriend's communication style is causing distress or making it difficult for you to address concerns, consider discussing it with her during a calmer moment.
Healthy communication in a relationship involves actively listening to each other, expressing emotions constructively, and working together to find solutions. If difficulties persist, couples' counseling can be beneficial in improving communication and strengthening the relationship.