You don’t understand how it happened. How could my partner do this? How can I trust him/her again?
You found out that your partner violated a boundary with you. Maybe your partner had an affair, or did something financially that impacted you. Perhaps he/she had been associating with people you didn’t approve of and you did not know he/she was doing this. Maybe your partner did not protect you or stand up for you during a difficult situation, or was not there for you when you really needed your partner.
Or You might be the one who has done the behavior which has injured your partner.
As a couple it is difficult but it is possible to repair your relationship. I have worked with many couples who have been through various injuries, violations, and setbacks. We have been able to talk about what prompted the situation, how that has affected the injured partner, and what is necessary to heal the injury for both. We make sense of what happened even though it feels like there is none. There is relief and resolution.