Said the dress was 'too revealing', we left without buying it

I tried on a dress that I had especially dreamt of for the wedding at the store. Just when I was about to buy it, my fiancé said, “a bride too revealing doesn’t suit her fiancé” and didn’t want me to get it. In that moment, I left without saying anything to avoid an argument, but it really stuck with me. He had never interfered with something like this before. My mind is confused. Should I consider this a boundary or just his opinion?