Here are some expressions on this subject: "(s)he is two-faced " - A person who presents themselves differently to two or more people, in a deceitful manner "I am of two minds as to whether I will go out tonight" - you have two very different paths to choose, and strong arguments in your own head for both. Your two minds wish to make opposite choices. "He runs hot and cold" The person has many mood changes that go from one extreme to the other "He didn't know if he was Aurthur or Martha" the person is very confused. Literally it suggests gender confusion, but in use, it means that the person was so confused they could forget whether they were a man or a woman. In life, there are some people with medical and mental problems that can have this behavior too.