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Well, if your wife truly believes that she saw you kissing another woman which obviously is not the case by all accounts then i believe she is suffering from what is clinical described as Delusional Disorder and the type of delusion that she is having is called as Delusion of Jealousy or Othello Syndrome ( i,e is derived from Shakespeare playright Othello where the lead character Othello starts doubting his partner of infidelity which becomes so severe that he kills her in a fit of rage, this character became the base of naming this disorder as Othello Syndrome since here too the person develops strong perception and belief that his / her partner is having an affair with someone else and such a person can also start having hallucinations similar to your wife.
So it is my humble opinion that you get her evaluated by a psychiatrist for Delusional Disorder and get her started on medications which shall be able to help her overcome this condition.
So i hope this makes sense and gives you a direction to move in. Yes, taking her to a psychiatrist for evaluation may be a daunting task but it needs to be done nonetheless since with time the condition will only become worse and more dangerous for both of you.
I hope this helps.
Wish you all the best.
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