I absolutely agree. No one deserves that Mitch...its emotional garbage she's dumpiing on you. And you're right to question why she didn't leave you before doing this, not to mention seeming to brag that she had done it (offering details) which could only be hurtful.

If it were me, I'm sorry, I'd kick her to the curb...NOW. But if you do want to save the tatters of what she's left of your marriage, both of you need to go into counselling ...immediately.

I hope things work out the way you deserve and need....just remember, that may not be the same as what you want.