I'm sorry this happened.
The one hard and fast request that has been continuously agreed upon by both of us is that we always use a condom with metas, unless previously discussed. From what I understand, this is a commonly accepted exception to the no rules nature of polyamory.
I don't know where you got the idea that polyamory means "no rules." Some people want less commitments and and others want MORE commitments with their poly practice. People are different.
It sounds like husband and friend both owned it immediately afterwards, and apologized. Was it a full apology though, that included changes in behavior?
As a woman with a functioning reproductive system, this request is important to me to preserve my own safety, and the safety of those I love.
On your end, since you value that, will you start using condoms with your spouse now, so if there's another breech on his side (intentional or not) you have been using your safer-sex practices on your side to help keep you safe? Are you both going to have regular STD labs done?
When you leave it to him to protect you, you are passing the responsibility onto him. I think you could be the one taking care of your body, while he takes care of his, rather than "trading," so to speak.
Will he be giving up drinking on dates, going into things SOBER and not messing up like that again? Will he be carrying condoms with him at all times? Will he change how he talks about sex with people, so that ONE of them has condoms?
How about the friend? Was this a one-time thing, or are they going to keep dating/sharing sex? Are you okay with husband dating your friends, or are they on the "messy list" for you, i.e., people you prefer your husband does NOT date because it makes it too weird for you or takes away your support network if there's a problem? You probably do not want your husband dating your parents, your boss at work, your best friend who is your sounding board, YKWIM?
Think about a full apology and changes in behavior. To me, it sounds like initial steps have been taken, but you are all still working it out. It's not yesterday, but 3 months since the incident is not that long, and since it came when it did, it sounds like it dinged you extra.
You JUST changed your name to his. You two had only been married 6 months. Maybe you were hoping to enjoy the first year of being newlyweds without turbulence and here came some stuff. It's disappointing.
Maybe this means you slow down any other "marriage mergers" still pending. You changed your last name to his. But maybe you keep your own finances mostly separate and only have one joint checking account for house bills, if you live together. Maybe you aren't in a rush to change your will yet. Maybe you postpone family planning if you were talking about it. Things like that. Cuz it's easier to divorce with no kids than with kids.
But I don't get where YOUR self worth comes into this. He messed up. Why's that make YOU a bad person or less valuable? Could you be willing to clarify?
Galagirl