I believe that I have a keylogger or some sort of spyware installed on my mac, please help!

I have many reasons to believe that my ex boyfriend installed a keylogger or spyware on my macbook. I have done a lot of research and cannot find the answers that I am looking for. I have taken a screenshot of my activity monitor in hopes that someone can let me know if anything looks suspicious. It appears fine to me, although I am confidant that I something is installed and being used regularly to snoop and creep my every move on my computer, please help me, any advice would be helpful. As a footnote I have installed macscan and completed a scan and it came up with nothing... I am not being paranoid my ex has basically confirmed my suspicions.