This...very much reminds me...
...of the Craigslist / Condom / Pregnancy thread.
I'm not exactly sure why people think punishing or embarrassing the other person in personal relationships is the thing to do. Again, just as it did then, it strikes me as childish. Some of you guys seem AWFUL eager to seize the opportunity to "get back at" a member of the other gender. I'm betting your reviews are real graphic and you bargain hunt as well.
Insofar as what I would do - it is the lie that is the problem. As said by others...lying is a really big problem in a relationship of this sort.
However, as others suggested, it doesn't have to be the end of things. You now know who you are dealing with. If you just act accordingly, you can still derive the benefits you seek while "protecting yourself" in whatever shape or form you deem necessary, now that you know that this person is untrustworthy.
I say just go forward equipped with the information and act accordingly...but don't do anything regarding it right now without reason. Because at this point, what would be the reason other than to say "BOOM BITCH!!! CAUGHT YA!!! YOU'VE BEEN OWNED!!!"
Which strikes me as kinda juvenile (just as it did before in the other thread), and somewhat a case of cutting off your nose to spite your face (assuming you LIKE fucking her).