I would ask him, why do you do this why not tell, but if he felt really guilty, he would have corrected itself, but I would have a chance just once. If something like this happens again. I think he must be cancelled.
I would ask him Why are you doing this Why did not you tell But if he was feeling really guilty I would give him edit himself. But I would take this opportunity once. If there is such a thing happening again. I think it stunts
I'll ask him, why are you doing this, why didn't you tell, but if he really feel guilty would let him fix it yourself. But I'll give it once. If something like this happens again, I think it must stop.