I'm about to end this for my own happiness

I am so sick of having my fiancé turn me down for sex, we have sex maybe 3 times a month if I'm lucky. but he watches porn instead. He watches specifically porn of girls by themselves, no guys involved, twerking naked with huge asses. It makes me feel like my body isn't good enough and he basically confirms it be saying "you would look perfect if you gained 20 pounds." "I gotta keep you eating so your ass gets bigger." Etc. etc. etc. etc.!!

I'm fine with a normal amount of him masterbating to porn, he's human and I'm don't own his right to do that but he does this constantly then turns ME down. I have told him OVER AND OVER it's effecting the way I feel about him and he won't change, he just hides it better. I don't even get angry about this anymore, because it has gotten to the point where I just don't have those loving feelings for him because of this. It's such a shame because I thought he was truly the one.