Hypothetically, Paying a real life girl for her nudes, who you can also interact with, to me would feel fucking awful compared to my boyfriend just watching generic porn.
However, if you pay for an onlyfans account, you are paying for nudes of other women.
This is a subreddit dedicated to asking women for advice.
Is he openly looking at it in front of you? Elizabeth Berkley, known for Saved By The Bell, went on to make Showgirls.
They clearly had that chat and one of them went back on what they said.
This is not your soapbox.
If i were in your shoes I'd attempt one last conversation and lay out exactly what you expect.
You are not over reacting and the fact that he actively dismisses your concerns is a huge red flag.