My guess is she has had an affair with this guy AT SOME POINT SINCE YOU'VE BEEN MARRIED and was using *this* to justify her own crappy behavior so she wouldn't have to feel guilty. (I'm cheating on an abuser, that doesn't count, right?)She screamed that I had abused him and went through the house screaming this, and locked herself in the bathroom.
You are SO WELL RID of this woman; it is a GREAT thing!
Instead of regretting that your children don't have an 'intact' family with you and their drama-mama, take heart in the fact that AFTER you get some IC and get your co-dependency dealt with (so you can make a better choice for your future than you did for your past), you will then be free to choose a GOOD WOMAN for your wife.
At that point, you and GOOD WIFE will be modeling PROPER ADULT BEHAVIOR (both genders) and proper MARRIED BEHAVIOR for your children. Things they NEVER WOULD HAVE WITNESSED had you stayed married to their idiot-mother (which, of course, you will NEVER call her around your children...you'll just THINK it...real LOUDLY).