How do i know if porn is replacing me?

I have been with my boyfriend for 4 years just recently i found Hustler video hidden up in the cabinet after searching the apartment i found 4 more movies and a couple magazines. I was furious i confronted him and he was so embarassed. I talked to him and told him how uncomfortable they made me feel he agreed to stop watching. A wk later i found another video hidden outside his house and this week i found one in the trunk of his car. He says he doesnt watch them our sex life is great but he doesnt seem that into it. What should i do i feel like im being replaced by blonde bimbos on t.v someone please help me.