Since you know he is itching for a row, hopefully you can sidestep it! It's going to drive him crazy, but he has to go through it. At some point, when he can't drawn you in, he may realize that it is him he is really upset with. Though in his current state I would not count on that.
The WAS trying to get the LBS to be the "bad guy" seems to be a pretty common theme. Actually, I think my W would say that her leaving was my idea. They don't want the responsibility.
