I understand, David. Who wants to be their own wife's second choice, only a fall-back position when things aren't go so well in affair-land??
Stay strong and unwavering in your stance. I suspect that if you do, you may get a second chance at how to handle her wanting to reconcile with you. If/when she does, just tell her "I'm not sure how I feel about that anymore. I'll have to think about it some, and get back to you," and then come and post here.
We could have told you the pitfalls of Friday night, and better equipped you.