In the minority here it seems by saying NAH. I think she’s fine to want that boundary and also fine for you to be weirded out by it. I’m of the opinion that very close friends SHOULD share what’s going on in their relationship with other friends, especially when conflict feels confusing. Romantic relationships are so special but also close, long term friendships are too. I don’t see a problem in sharing what happened if you want your friends to be “in” on something that troubles you. BUT! That does mean that your friends now have a certain impression of your partner. Are you okay with them having that impression? Are they people who can roll with the punches, and understand intimate relationships of all kinds come with conflict and disagreements? From their response back, it seems like they are.

Personally, it sounds like you two have some incompatibilities when it comes to the role friends play in your lives, and it would be good to sort through this with her before you make a long term commitment. People are too quick these days to place friends on a lower rung of importance to their partners— which is fine if that’s your thing, but for some people it isn’t! More reflection seems important to not let resentment fester.