The Porn Battle

I've been dating my boyfriend over 2yrs now and it's been a wonderful rollercoaster except for our constant fight over porn. He does own his own place and I stay there 3-4 times a week and our sex life is anything but alive. Sure I give him his bjs and well that's about all except for the occasional sex. I constantly try to spice up our lives and try to sext with him or surprise him in different ways with different things but he never wants to do any of it. He recently told me I am too much of a stressor so he can't see me naked and he would rather look at other girls. He calls it his stress-reliever. It kinda stung. I get that guys are gonna use porn and everything but he will willingly pick that over me everytime and I don't want to overreact like I'm pretty much doing, but how do I even approach the situation except apologize for the wrong I didn't know I did.