I'm so sick of seeing PORN SURROUND HIM

On all of my SO social media and electronics there is porn. I just found SNAPCHAT with porn girls. I feel hurt and angry. He has been snapchatting his ex and girls he used to fuck/wanted to fuck. Also his Facebook messages with them have "magically" been getting deleted. Anytime I bring this up he just yells at me and tells me he will never change and I'm just overreacting. He says porn is just artwork to him and it doesn't turn him on at all. We are at the point where I have to instigate sex and 98% of the time he laughs and tells me no, just to leave him alone. We are only having sex 2 times a month and he looks at porn almost every other day but denies it. His phone records and social media accounts show saved time stamps of his saved "favorite" porn. I don't know what the fuck to feel or do anymore. ***Update He said that he deleted the conversation with his ex because she asked him to so nobody could see that they were talking about a mutual friend doing drugs and other things :(. I want to trust him but this isn't the first time he has said that he deleted the conversation because she asked him not to let me see...