Advice Needed

I’m in an open relationship with Alex. Last week we went to this really intimate party where everyone knows the rules are whatever you want them to be. I ended up getting naked with someone else, didn’t know him beforehand, not even his name, and it felt...fantastic. Mind-blowing, actually. But now I’m worried about what this means for me and Alex. Should we just focus on other people from here? Is everyone going to think he’s a jerk if I stick around but don't want to stop exploring like this? What do you guys think is normal or okay in an open relationship?