First time it was 10 years ago when I found out she was talking and texting her colleague at work but never admitted anything happened between them which I kinda believe because she is seeking for external validation rather than intimacy etc.
If there's one thing I've learned, it's that most instances of infidelity stem from someone seeking external validation, whether male or female, but it does seem a little more common with females.
There's a saying, "men tend to trade attention for sex, and women tend to trade sex for attention." Now, that can be reversed for sure, but that does generally seem to be the case quite often.
Your wife may be telling you the truth and things never went beyond text messages, but you'd be shocked at how many times that's been said only to find out down the road that things turned physical. I'm not saying that's definitely the case with your wife, but I think you should brace yourself for more possible revelations. It's very, very, very rare for a betrayed spouse to get the whole truth, the entire story, right out of the gates. Almost every single wayward spouse downplays, minimizes, and obfuscates what actually happened upon discovery.
I think Bigger, as usual, has some good advice for you. Tell her you want a timeline with at least approximate dates, what all was said, what happened, and how far it went. Tell her you're willing to offer temporary immunity in as far as you'll be willing to at least try to work through whatever it is as long as you have the whole truth. Finding out anything later will pretty much guarantee separation. Tell her you plan to verify with a polygraph. Even if you don't do one, her reaction could tell you a lot by itself.
As far as whether or not you should forgive (or reconcile), that's entirely up to you. Many have worked through much worse than what you've been told so far. That's not to downplay what she did. Betrayal is betrayal, but a lot of that will depend on you, and how she handles her side of it.
[This message edited by Pogre at 5:41 PM, Thursday, May 14th]