You have a husband problem.
I Installed a Secret Camera After My MIL Insisted on Having Our Key

We all value our privacy, especially in the comfort of our own homes. For Natalie, a Bright Side reader, this privacy was tested when her husband gave their house key to his mother. What followed was a surprising turn of events that left Natalie stunned, and she shared her story with us.
This is Natalie’s letter:

Thanks for reaching out, Natalie, and we appreciate your trust in us for advice. Here are some tips we think you’ll find useful.
Communicate calmly with your husband.
Schedule a calm and private conversation with your husband to express your feelings. Share how his decision to give his mother the house key without consulting you impacted your trust and sense of security.
Emphasize the need for mutual respect in your relationship and how boundaries with family members should be discussed together. Encourage him to share his perspective, but be clear about your expectations moving forward.
Set clear boundaries with his mother.
After discussing with your husband, it might be beneficial to have a direct conversation with his mother. Politely but firmly explain that while you appreciate her past gifts, the key to your home was meant for your family’s privacy and security.
Set clear boundaries about her access to your home and how you expect her to respect your space in the future. This can help establish a more respectful dynamic moving forward.
Involve a neutral third party if necessary.

And your still with him WHY??? Sorry but I'd have NOPED right out of his and Mommy's house!! You can find a better man with a more stable mother!!
If communication doesn’t lead to resolution, consider seeking couples counseling. A neutral third party, can facilitate discussions about your feelings and your husband’s loyalty to his mother. This might help both of you understand each other’s viewpoints better and develop strategies to navigate family dynamics.
Counseling can also provide a safe space for you to express feelings you may find difficult to articulate alone.
Evaluate your own space and security.
Given the breach of trust, take practical steps to secure your home. This might include changing the locks and removing any keys you’ve previously given to his mother. Reinforce your sense of security in your home by installing additional security measures, such as an alarm system or security cameras.
This action not only protects your physical space but also symbolizes taking control of the situation, which can be empowering during this difficult time.
Navigating family relationships can be challenging, especially as we build our own lives. Recently, a Bright Side reader shared her story about struggling with her mother’s refusal to help with her grandchild. Dive into her experience and discover the insights we offered to support her.
Comments
Given thr OP is dealing with a narcissist and a mama's boy, therapy isn't going to help. Narcissist's weaponize the therapy to gain more info so they can further abuse you with it.
The only choice the OP has is divorce. Nothing she does will make it better.
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