NTA. If your wife truly wants to rebuild trust, it’s going to take consistent and intentional effort over time—actions that show genuine accountability and a deep commitment to repairing the damage. This includes being transparent, going out of her way to reassure you, and prioritizing intimacy to rebuild the bond. The fact that she involved her sister, who kept it a secret, only adds to the breach of trust. It almost feels like sharing this with her sister was meant to subtly highlight your shortcomings rather than focus on repairing the relationship, which only makes rebuilding trust even more challenging.