A friend of nearly 20 years (grew up together, high school together etc) had a first birthday party for her DS at the weekend and didn't invite me or my 10 month old DD. I found out about the party after seeing photos on social media. I wouldn't be upset if it was just a family thing but mutual friends attended with their babies. As far as I'm aware there's been no falling out and I'm at a loss as to why we were excluded when we have been close friends for years. This isn't someone who I text once a year, it's someone who's been a big part of my life for so long.
So my AIBU, should I ask why and explain I'm upset at being left out? I don't want to leave things to bubble over. Or do I just leave it?