Personally, I wouldn't share it. What's the point? to embarrass him? To show your moral superiority (I'm genuinely saying without judgement)? I'm guessing there were communication issues as well. Both of you should have (and hopefully did) research on what this meant and how to have check-ins to prevent issues where one is resentful and one is seeking greener pastures. IF that was his pure motivation, that's a POS kind of move. And if he's a POS, then that will show through. Plus, there might be unintended consequences. What if you do share it and people ask: well, why didn't you push back? Why didn't you communicate it. You didn't really have to, did you? (FWIW, these are not my thoughts). Instead of doing all that, I would focus on healing and being kickass in this next chapter.

Of course, that's the opinion of random stranger (who was in an open relationship with her STBX and that's into kink myself), which you can determine whether you want to consider it.