Well, if he's not gazing at the pictures, then I wouldn't think it's as big a deal. I mean, if it's his screensaver, then yes, that has to stop. But if they're just hidden away on his hard drive that's not too bad. Or in some box in the attic. It might be a bit much to ask him to get rid of every single wedding photo. I think what I reacted to in your note was the implied volume of photos -- surely some could go or be stored, if that's their purpose.
Also, context is important. Are they pictures of his trip to Italy, but she happens to be in them? Or are they smoochy lover pics? I would probably resent being asked to get rid of any photo that had an ex, if the context was just my life at the time and he happened to be there. But I don't keep "hundreds of them" and I don't keep smoochy ones.
I would definitely take issue with the love notes and ring, though. That's different.
I am going through a divorce. I can barely stand to see my husband. The sound of his voice makes my skin crawl. And yet I probably have hundreds of pictures of him on my computer. And I have a box with lots and lots of pictures of him and our girls and me giving birth to them in the hospital. The idea of a partner expecting me to destroy them or hide them away in someone else's house would be not only incomprehensible to me but also just insulting as it implies that they don't believe that this is over and still see my ex as a competitor as well as refusing to understand me making a difficult decision for the sake of my children. I can't expunge my stbx from my life. It's not possible. He is my children's father. Now I don't intend to keep my wedding ring. If I had one child I probably would and give it to her. Since I have two daughters there's no point in that. I know other people who were given their parents wedding rings and treasured them despite the divorce. And pictures my god pictures are so important to kids. I never saw a picture of me with my father or us as a family until I was 21. My mom didn't take a single picture with her including any that were taken while she was married to him whether he was in them or not. It was so wonderful to finally see that time of my life. I would never keep that from my children. Not from anyone and honestly anyone who pushed that issue with me would not remain in my life. Love letters I would not keep. I would not allow my children to read them and the letters mean nothing to me now. So I'll grant you the love letters. I would question those. But the pictures especially on a computer and his wedding ring? Sorry from my pov you have no right at all to ask him to get rid of those. Not at all.