Husband somehow hid "Inprivate browsing", i don't want him to see what i do online. how to get it back?

So a lot of times when he is away I search the internet with the Inprivate browsing so he cant see what i'm looking up through the day. You know like ex-boyfriends on facebook or porn and sites I would not want him to see. He got nosey after he saw i was emailing an ex and i was on porn a lot...whats the big deal with that? He says it hurt that we never have sex and then i'm looking up porn. I mean sex with him is awesome, best i ever had but i need variety or i'll get bored of just him. After this he checks, he has been so insecure after he saw that its almost pathetic. Anyways how do i surf the net without him knowing? I can't deal with his drama and i can't just delete all history or he'll know.