Start by having an honest conversation with your husband about how hurt you are—not just by being uninvited, but by his decision to attend the wedding without you. Let him know that his reaction made you feel unsupported and disrespected, and explain how it affected your trust. Keep the discussion calm and centered on expressing your emotions, not assigning blame.

You can also propose a compromise. Suggest that he attend only part of the ceremony, or consider skipping it entirely while the two of you send a thoughtful gift instead. This allows him to show support for his cousin without dismissing your feelings. Offering alternative ways to honor the couple may help you both reach middle ground.

Given how deeply this situation impacts your relationship, couples counseling could be helpful. A neutral professional can help both of you communicate more effectively, understand each other’s perspectives, and rebuild trust. Sometimes an outside voice makes it easier to navigate emotional conflict.

Finally, reflect on whether this incident is part of a larger pattern. If your husband consistently prioritizes others over you or fails to defend you, it may be time to set clearer boundaries and discuss expectations for mutual respect moving forward. Your feelings deserve to be acknowledged, and your relationship should feel like a partnership—not a place where you stand alone.