My (38m) husband (35m), broke our open relationship rules and I'm struggling with what to do and say.

I will open by saying that, while this is a big deal, he is a great guy that is, until now, honest to a fault and has done above and beyond for me. I'm usually the one pushing boundaries (not cheating) and this is a first for our relationship. I don't think that splitting is something I want to do, so please be respectful of this.

Now onto the issue...

I have always advocated for an open relationship, as I feel with proper communication and healthy boundaries it can be fun and bring some couple closer. My husband was extremely conservative and didn't really believe in them, so for a long time we were monogamous. We eventually played with others and, on rare occasions with a LOT of communication, separately with trusted friends and only when travelling.

I've always made sure to let him set the rules with whatever we do and we recently had another conversation regarding what the rules and guidelines of our arrangement was.

As the title says, he recently shared that he broke the rules he set, and even though I'm okay with him sleeping with someone else, I'm just upset that he broke his own rules and effectively tied my hands from having experiences of my own. I feel like its all very hypocritical on his end. I also feel like I've been lied to and trapped in rules that he isn't abiding to.

I'm not sure what to do and I'm struggling with how to talk to him about this. I really don't have an issue with him playing around, but keeping it from me and breaking his own rules while I have to be good is frustrating. Any advice? What should I say? What is a really good next step?

*Edit - the rules that are applicable to.this senario are:

1. We only play with people we both knew and each approved of. If one vetoed, then we didn't play with that person/people.

2. We only played separately while travelling. If one person was out of town, both could play, though Rule 1 still remained in effect.

3. Communication before and after. If something happened while hanging out with a friend and you didn't get the chance to communicate before hand, you needed to contact the other asap afterwards.