I will just say this, and it sort of goes against the general tone of this thread - it's not about what your wife wants at this point, it's about what YOU want. And - and this is coming from me, a BS as well - it IS wise advice to say that knowing what you really want takes time, and you can't really put a deadline on that. There should be no 'this is the date I will make the decision about our future' - you may need more time. You may need less, but I do think it's worth getting a little further away from D-Day to make that decision.
I agree that it's not her words that matter, it's her actions. It may only be regret right now and not REAL remorse, but IMO, most of the time real remorse requires IC, a LOT of introspection and digging into the darkest parts of oneself and figuring out the 'whys', and a LOT of honest, deep and often hellishly difficult conversation with the BS (if they choose R). I DO wholeheartedly believe one thing, though - a lot of affair sh*t, the things that are said and done, make NO sense. And when a WS looks back after getting that blast of cold water - they don't think it makes sense, either.
I try to (and this is not valid, in some people's opinions, because there WERE extenuating circumstances, ie a marriage and betrayal of vows, but bear with me) think of it like MY old relationships that I am no longer in. I had a long-term bf once that I said I loved on a daily basis, thought I still did. I kept the relationship going FAR beyond what it should have. I was relieved when we broke up, and realized right then that I hadn't loved him for a long time and should have ended it before. And looking back on our relationship at the end there was sort of cringeworthy to me later on. But I still thought I meant the stuff I was saying at the time, still thought I wanted to be with him. In hindsight, I realize I didn't really.
It happens. Hindsight is 20/20. Just because what she's saying now doesn't match what she was saying then doesn't mean she didn't believe and mean BOTH things. It sucks for you, and it's SO unfair because in the end, YOU were the one she owed her fidelity to and it never should have EVER come up with someone else. This situation is utter crap. But...just being devil's advocate here. Her explanations don't make sense because she's scrambling to figure out what the hell she was thinking too. So she's saying things as they come to her, which is why true remorse and understanding of self takes time and a LOT more thinking/exploring. You know?
You're angry, and you should be. You're traumatized. Some distance might help, or you might already be set in your decision. Whatever you do, just make sure you take whatever time YOU need and act according to what YOU feel is best for YOU. She will continue to work on herself, hopefully, so she comes out the other end a better person...with or without you and the marriage.
You can D and part ways. You can R and do the work together if her actions back up the stuff she's saying. Or you can D, then remarry later once you see she's really changed. Or...I don't know. My point is...make sure what you do is really what you want to do. Not what she wants to do, not what the people on this forum tell you you should do. Their advice comes from the heart, as might her wish to build a new, better marriage as a safe partner for you - but in the end, it's your life.
You know? And also PS - I had surgery today and am on meds, so sorry if this message was long and rambling. Norco is my friend right now. 
[This message edited by beauchateaux at 12:39 AM, August 8th (Tuesday)]