So basically it sounds like she's trying to avoid the consequences of her actions. Geez, too bad. Don't you dare move out of your house! She wants only one parent in your house b/c of the boys (which it sounds like more that she's trying to minimize the impact on her from what you say) then she moves out. Period.
It sounds like you've worked this out, but if she returns to this, you know what to do. This is a rough time, but it gets so much better. I know the last IC you saw was horrible, but I do think the majority of them are good. I do think it would be good for you to see one, in addition to the ADs (good about those). This place is good and supportive friends are good too.
I've learned from this the importance of doing stuff that's enjoyable. With and without your kids. Take them to putt-putt or picnic or movies or anything. Spend some time with friends. Karen