my gf doesn't like me watching porn

My gf and I are both 17. I use to watch porn a lot until she told me about 8 months ago that me watching porn makes her uncomfortable, that she would rather I come to her when I'm horny, so since then I haven't watched porn or jacked off.
She constantly goes through my phone, my laptop history, even checks my ps4 history and Xbox one history.
My friend sent me a link to me on FB to some porn that he thought was funny but I never watched it, now she keeps digging at me saying I'm into sick shit for watching that kind of porn and for going behind her back. Do girls grow out of this? Is it a teen girl thing? I haven't even watched it and I'm getting sick of having to defend myself for something I haven't done