Dear Hunter, I don't know the details around the accusations, but I know that for me when I was accusing my H of cheating it was coming from insecurity in myself and insecurity in my relationship. Show your W that you care about making this right - helping her with her insecurities. Try as HARD as you can not to blame her for being the way she is, but show her support. This will help build her trust in you and also prevent the unthinkable to happen. At first, my H tried to show support, but then it turned to blame and resentment. Then he eventually cheated on me. Don't do that. Don't confirm what your W fears the most. It will make things worse for you, for her and for the relationship.
Hang in there. Continue to talk, be patient, show support, show that you can be trusted. Could she be feeling insecure about your relationship because of other things in your marriage? Talk with her about this.