If your girlfriend cheated on you and tried to hide it, her jealousy about you talking to another woman could stem from a few potential reasons:
Guilt: She may feel guilty about her own actions and projecting that guilt onto you. Seeing you interact with another woman might remind her of her betrayal, leading to feelings of jealousy and insecurity.
Fear of Losing You: If she truly cares about you and regrets her actions, the fear of losing you could trigger jealousy. The thought of you moving on and finding someone else may be unsettling to her.
Insecurity: Her cheating and attempts to hide it might be driven by underlying insecurities within the relationship. Now, she might feel threatened by the presence of another woman in your life and worry that she is easily replaceable.
Lack of Trust: If she cheated on you and tried to conceal it, it likely indicates a breach of trust in the relationship. As a result, she might struggle to trust you, leading to jealousy when you interact with other women.
Emotional Connection: She might have developed an emotional connection with the person she cheated with, and this could trigger jealousy when she sees you forming connections with other women, even if they are purely platonic.
It's essential to communicate openly and honestly with your girlfriend about these feelings and concerns. Addressing the root cause of her behavior and working through the issues together can be crucial for rebuilding trust and determining the future of your relationship. However, if the trust has been severely damaged and the relationship feels unsustainable, it might be worth considering seeking professional counseling or evaluating whether the relationship is healthy and fulfilling for both of you.