Yeah right. You can't tolerate lies like that. I think you can see why she did that, actually.

You should leave her, unless you are fine with her cheating on you. Alternatively, if she gets really invested in staying with you tell her to block him on everything, no matter what impact it has on her job. After giving it a thought it's probably not enough, they still work together.

Better would be her quitting her job as well. Logic is, we know why she has done her deeds. I am of the opinion people can occasionally make wrong decisions and regret them. However, to ensure they do not repeat, such decision must have direct negative consequences.