I need to see if my boyfriend is using my computer to look through my facebook or just look at porn.?

[seriouslyconcerned]

Recently, I've noticed in my browsing history that while my boyfriend is alone with my computer, many blocks of time have been deleted from my Google Chrome browsing history. At first, I thought maybe he was looking at porn and didn't want me to see. But the last time I checked, he had deleted history from when I was very briefly in the shower, and another time while I was making lunch in the same room as him.

I realized that I've been leaving my facebook open, giving him the opportunity to snoop. This wouldn't be the first time I caught him snooping, so I want to make sure I have proof before I confront him about it. Obviously this time he's going to greater lengths to cover his tracks.

I wondered if there was any way to recovered the history he's been deleting, or if there is a way to set a separate history tracker that he wouldn't know to delete.