This is crazy but when we look at it from another angle and base on your statement in this post..
He made a rule and he has informed everyone of his intention so it should not come as a surprise, moreover we don't really know what he has discussed with the lady before that happen..
He didn't make the rule public until late last month.. Over here, that's not how things are done. You usually give at least two months notice ahead, to give people time to make up their mind on if they're leaving or staying.