Bf keeps doing shady things online

My bf and I have been together for about 8 years. Throughout this whole time I have found various sites he's been on (hot or not, bangme.net, plenty of fish, tinder etc) as well as a whole slew of nudes pics he's saved on his server. Most of the nude pics were ex gfs and dating back 15 years. 6 years ago I busted him for everything and he said he deleted everything. Fast forward to last year when I found his pof and tinder. openly talking to girls and explaining he coulnd't met them because of "baby mama drama". I confronted him, he deleted everything in front of me. This weekend I found that while he's sitting with our children and I'm sleeping or not home he's browsing and downloading porn (i don't care so much about random porn) and browsing, and saving nudes from imagur and reddit. I had found reddit crap months ago and explained how it made me feel that while I'm laying in bed waiting for him he's puttin g forth energy to search and hide various nude girls pics. He said he understood. This past weekend he left his tablet at home. He had been taking 2 hour long showers and staying in the living room for hours before bed so i was curious. I found various pics and movies. I also found recent pics of an ex gf who has been an issue from the start of mine and his relationship. Then the icing on the cake was finding nudes he had taken of himself (3 of them, one of his face, one full frontal nude and one of just his penis) that I had never seen before. I'm assuming he's sent them to girls because why else would you take nudes?? He's not answering my question of why he took them, or why all of a sudden there's pics of his ex saved on his precious server... I have no one to talk to about this because I'm humiliated. Any advice is appreciated. What the hell am I supposed to do??