How do I convenience​ a Sceptic?

Me and the love of my life have a major problem since about a month after we moved in together which is way too long since February..ED which he believes I'm selfish and not trying because he does not believe ED can come from masterbating or definitely not his 1st love Porn..he doesn't realize that too much of a good thing is bad.Now he swears he stopped masterbating shortly after we moved in together as he was satisfied..but he's masterbated everyday if not more since he was 7 now 41,and when I asked he got defensive saying "I don't care if you believe me or not!"(of course that could be the narcissist talking)..and I've been noticing many issues with the porn,and I know he's not just addicted he's obsessed!!!All he does when he's not working is watch porn all evening,all night,during sex,after sex,different types of porn as well and they hardly make him hard,I get it hard but it goes down as quickly as I get it up and it don't come back..he's horny every night but it usually ends with him angry because I've moved during sex or not kept the same pace w/hand jobs of head but that's after 3-5 hours of effort! on a limp d*ck!..I've brought conditioning up to him around March but he's says that's not the case that I don't pay attention to how he likes things..we are both getting to the point that were scared to touch each other because of failier..how can I convince him to seek help?