Op this is a huge breach of privacy and trust. I think he probably is sharing them. It wouldn't surprise me if your porn is all over the Internet, and I would put money on his friendsat least having seen these photos and videos.
I wouldn't say anything yet, but try to trawl his device history for porn sites, 4chan etc, and see if he has any accounts (and check his whatsapp/messenger etc).
Delete everything you can find involving yourself, from the web and devices.
Only then, would I ask him if he's ever videoed you in this way, to see what he admits too (in case he admits to anything you've missed). I would try to act totally unbothered "ooh okay, show me" to get as much info as possible. Then when I thought I'd wrangled everything I could out of him, I'd ask him to leave. He needs a woman whose into this sort of thing, and consenting from the start, and you need a man who won't disrespect, abuse or exploit you.
This is not normal, don't try to let him tell you "everyone does it". This is a niche, fetish type "hobby", and done without consent, is sexually abusive/exploitive. He's abused you in an awful way, and it's worrying this didn't ring alarm bells for you when you first realised. Have you felt afraid to ask him to stop? Does he overstep boundaries in other ways?