AITA for reading my boyfriend the story I posted on reddit about him. changing names and dates

So I had posted in relationship advice about a situation with me and my boyfriend to get outside perspective. When we started dating he messed around with other women still and to this day has nudes saved from one if the girls.

After posting that and reading comments I then went to my boyfriend and read it to him just changing names and dates and he went off how that person should leave him and he's a piece of garbage for doing that. I then told him i posted it about us and he is very upset I baited him like that. I wanted him to see his actions for what they were. Am I the asshole?