I can offer some general insights into potential reasons why your husband might want to stay in the relationship despite your infidelity and his covert narcissism.
Narcissistic supply: Covert narcissists, like other narcissistic individuals, thrive on attention, admiration, and validation. They may be reluctant to let go of a partner who provides them with this narcissistic supply, even if the relationship is not entirely healthy.
Fear of abandonment: Narcissists often have a deep-seated fear of being abandoned or rejected. The idea of losing a partner, especially if they have invested a significant amount of time and effort into the relationship, can trigger feelings of insecurity and fear.
Control and manipulation: Some narcissists may try to maintain control over their partners. By staying in the relationship after your infidelity, he may believe he can keep you emotionally attached and manipulate you to his advantage.
Lack of accountability: Narcissists tend to avoid taking responsibility for their actions and might be more inclined to blame others for relationship issues. By staying, he may be able to rationalize your infidelity as the cause of any problems, deflecting attention away from his own behavior.
Fear of exposure: Covert narcissists typically work hard to maintain a positive public image and may be reluctant to reveal relationship problems to others. Staying together might help protect his public persona.
Low self-esteem: Underneath the grandiose facade, many narcissists have fragile self-esteem and fear being alone. Staying in the relationship may be a way for him to avoid facing these insecurities.
It's important to recognize that every individual and relationship is unique, and these are just some general possibilities that may influence his decision. If you're both trying to work through the challenges in your relationship, seeking professional help from a therapist or counselor can be beneficial. They can provide guidance and support to address the underlying issues and help both of you navigate the complexities of the relationship. Remember that healing and rebuilding trust will take time and effort from both partners.