Fiancé porn hobby

My fiancé watches porn and jacks off. My concern is when I ask him to have sex he say ok and we don’t do it. He hits me on the butt and rub it but we rarely kiss when he leaves I had to tell him he don’t do it...one day I was using his phone and when I pulled up all the apps it shows he was on a porn app and he be responding to the girls like when they say they gone play with they self he says he want to watch...I asked him was he sexually attracted to me he said yes but the last time we had sex I don’t think he was really into it...my sex drive decreased because he don’t have sex with me he don’t even sleep in the bed with me no more he always playing his game and not showing me attention what should I do?