How do you reassure your partner you're not cheating?

My partner has been acting insecure lately and constantly questions whether I am cheating or not. I am not cheating but it is starting to create tension between us. I want to comfort my wife and rebuild trust but I don't know how to do this without making things worse. Do you have any advice for dealing with this situation?

How do you reassure your partner you're not cheating?
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