Not trying to give too much information but here’s a quick summary. There’s 5 of us in our friends group, 2 girls and 3 guys, two of the guys are currently going to two different schools while me and the other two girls attend the same school. It’s difficult to have a group hangout, we usually do a group hangout on the weekends due to distance. The two girls would hang out more than often without sometimes telling the rest of us. I love each and every one of them and we love each other unconditionally. So a friend that went to the same school with just me and guys a few years ago wanted to do a reunion to catch up. I suggested a boys night out as boys night only happens once every few months.... but the thing is the person from a few years ago is a girl and one of the girls in our group is upset that we’re excluding them. All of this was my plan, the guys decided that whoever comes is fine, and I also subsequently agreed to a group hangout. Am I the asshole for just wanting a boys night with a girl that we haven’t seen in years?

Tl;dr - girls in our 5 man group do their girl hangouts occasionally, a girl friend wanted to do a hangout with the guys, one of them girls is upset about the exclusion 