I don’t know how to move forward

I recently found that my fiancé has been following thousands of naked women. He also likes pictures from many of them on a regular basis. When I started seeing it I asked and he said it was just like watching porn. But these follows and likes are out there for everyone to see. I’m so embarrassed. I also now feel ugly and fat because he liked all these women that are tiny but with huge boobs and butts. I don’t know how to move forward and begin to feel secure again with him. I told him and he said he would unfollow but I just feel like If that’s what he likes, it’s not going to change just cause it made me sad.