Please help - need nudist advise!!!

I would like some input from any users on the site who are married. My husband claims to be a nudist. This came out of no where a few years ago. I am not comfortable being nude in front of anyone other than him. That's just me. To each their own! I caught him chatting online along with pics (fully nude) of himself. This has caused HUGE fights between us. My opinion is - you want to be a nudist - fine. Do it in our home and DO NOT post or share pics of yourself (or chat) naked. I feel like he is for my eyes only. Is he being unfaithful by continuing the chatting and posting? 95% of the time, it is with women - not men. If it is not a sexual thing, why is it primarily with women? I have made it very clear how this upsets me, yet it continues. I am trying to be open minded and respectful of his needs, but it seems almost to the point of addiction. He can't/won't stop. Any advise is appreciated!!!! Thank you :)