I can provide some general insights on this topic.
Whether or not to leave a spouse after they have slept with someone else, even if it was by accident, is a deeply personal and complex decision. It depends on various factors, including the individuals involved, the nature of their relationship, their values, and their ability to forgive and move forward.
Some people might consider an accidental encounter as a mistake and be willing to work through it, especially if the person who cheated is genuinely remorseful, takes responsibility for their actions, and commits to rebuilding trust. Couples therapy or counseling could be beneficial in such situations to help facilitate communication and healing.
On the other hand, some individuals may find it difficult to overcome the breach of trust, even if it was unintentional. For them, infidelity may be a deal-breaker, and they may decide to end the relationship.
Ultimately, there is no one-size-fits-all answer to this question. Each relationship is unique, and the decision to stay or leave after infidelity is entirely up to the individuals involved. It's crucial for both partners to communicate openly, honestly, and compassionately about their feelings and expectations moving forward. If needed, seeking guidance from a professional therapist can help in making the best decision for all parties involved.