I know how you feel!!!! I was in a relationships for 3 years with one guy, after two years our sexual relationships just become weird, I wasn't happy about that, so I start wondering why is that??? I asked him if I was doing something wrong or maybe he was doing something behind my back, and he said NO to all my questions....One day, I was on his computer and God knows why I went through the history and I saw all the porn web's he was on and that I saw saved videos on his computer and that made me sick...I fliped...When I asked him WHAT is UP with all that, he said to me that it's normal to watch porn, and I said :" It's normal,yeah, but it is not when you watch porn more often than you make love to me!!!" When we would have sex, it wasn't the same, he wouldn't put much offer to make me feel good, it was more like he was doing me a favor....
End of my story is really simple, we are no longer together( not just because he was watching porn ).