Am I being cheated on? Or do I believe him? Help me please.

I have no Idea what to do , I've been with my boyfriend for 6 year and were doing really good. But here's the thing, 3 years ago I found out he was on something called fling. But all the info he used was fake just his pictures were his. When found out he cried, went throughout hell and back to show me he was really sorry. I forgave him, and 2 years ago he did the same thing on adult finder. Again hell and back and I forgave him. Both these times I dug and didn't find anything beyond post, he told me it was self esteem issue he want to feel sexually attractive. Thing is he use to be over weight and i am his first girlfriend. He is a pretty sexual guy, not extreme. I will say that I don't really show him that I'm turned on by him, but he does show that with me. Last year he made a video of him masturbating and posted it on a site and I didn't find out about it to now. I want to leave for fear of it happening again. My dilemma , all other aspects he amazing, he attentive, he protective, make sure im taken care of without smothering me have great conversations, we laugh at the same things. Nothing else is really shady, where he says he's going is where he is. He calls me everyday after work before he goes to bed and random to say hi. Pretty much always answers his phone. And has never once not say I love you before he hangs ups no matter where he is. Everywhere he says he going is where he is. He has never once yelled at me or even raised his voice. I told him that I can't do it anymore, and he told me he would to anything to show me that he's never cheated only Internet thing and that's as far as it gone. Said he go see a pshycyatrist , therapist, and get rid of all Internet things. But i dont want that I want him to be able to fix the problem not just cover it and avoid it. My questions are, does he just have a internet-problem or insecurities or am I being played? Is this worth saving or just move on? Do I need to be more sexual?