So here’s the situation. I (30F) recently had a baby shower, and I invited a bunch of close friends and their partners. My husband Jesse has a longtime friend group from high school that includes Joe, Alex, and a few others. Joe is currently dating Diana, and Alex is engaged to Sara.

Now here’s where it gets messy. Apparently, before Diana and Joe ever met, Joe had a fling with Sara—nothing serious, just a brief thing. At some point, Joe told Diana about it, and now Diana refuses to go to any event where Sara will be present. She says it makes her uncomfortable, even though this all happened before they were together.

Because of this, Joe and Diana have pretty much stopped talking to Alex, who’s been friends with Joe and Jesse for years. They think it’s wrong of Alex to still be with Sara, I guess? But to be clear, nobody else in the friend group has any issue with Sara. She’s always been sweet and supportive, and now she’s engaged to Alex, so she’s part of the circle.

When it came time for my baby shower, I invited Alex and naturally included Sara, too. I didn’t think twice about it—she’s never done anything wrong to me or anyone else, and it would’ve felt rude to exclude her over something that seems more like a personal grudge.

Well, Diana found out Sara would be there and got really upset. She said I was being inconsiderate of her feelings and basically implied that I chose sides by inviting Sara. She ended up not coming to the shower, and now things are tense between us.

So… AITAH for inviting someone my friend’s boyfriend used to have a fling with, knowing my friend has a problem with her?