Ok so the point of this thread is to not point him out by you saying so, but for him to come out saying it? To me i just see this as a fail thread, not does he not have to post but if he does all it will look like is you flaming him for nothing, and PM's are "private messages" so best to keep them private. If he wanted to flame you or w/e in public, he would have.
And if you wanna continue this fail thread, might as well post the pm.