I could be into it but wife won’t open up

I recently discovered through questioning some situations from our past that didn’t add up that my wife had been unfaithful to me a long time ago.
After thinking about the new details for some time and questioning her for more details i found my self getting aroused by the thoughts of what she may have done.
I have told her that i am feeling this way and am all good with it if she can just open up and discuss the details with me.
She flatly refuses to share anything more with me other than the fact that it happened with just one man more than once.
How do i get her to open up so that we can explore this new feeling i have?
 
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