Mega Gripe

My co-worker and our boss have been having an affair for the last 6 months now. He gathered me as I am his secretary and his assistant into a meeting to tell us we have to cover for him if he is busy or out with said co-worker when his wife phones or comes by. He instructed us to tell her he had a very important errand or meeting to attend. I do not feel right lying to this poor na?ve women and think he is a louse for asking this of us. This is not in our job descriptions.