You had a person tell you who you have been looking up on your computer and they have never been on your computer how did he do that He showed you the dates and times on his computer answer that?

Answer 1

Your possible answers are:

He hacked your computer - He would have to be very good with computers.

Has managed to install a program on your computer that monitors you, your internet etc...

Or has some how managed to get you to install a program with a hidden purpose.

If you are on a network and his computer is the administrator he might be able to access your computer.

The settings on your computer might allow him to remotely access your computer, giving him full control.

Or he is some how playing an elaborate trick and has managed to gain physical access to your computer, or even have a friend help.