Definition: Given a real-life anecdote of a complex ethical situation, generate a suitable title that describes the main event/root cause of the situation. Imagine that the given text is a social media post, and you have to write the title of the post, so the users can decide to read the main text or not.
Input: I (26F) have 2 main groups of friends, a group that I've been friends with since high school (call group A) and a group of friends that I've known since I was 19 (call group B), and I have one best friend who is part of both groups with me. We do many things with both groups of friends, but it's always been seperate, simply because both groups don't really know each other that well, and wouldn't really mix with each other and a few girls out of each group don't really get along. 

Quite a while ago, a girl out of Group B planned a night of drinking at hers, unfortunately my partner was out and I couldn't find anyone to look after my children that particular night so I had to decline. The day it was planned for came up and a girl out of group A messaged us all and asked if we wanted to meet up that night but same as above applied and I had to decline, another girl had suggested they could come to mine instead so I said you're more than welcome, so some of group A came to mine for a couple of hours for a mini catch up.

Somehow, the people from group B found out and they are not happy one bit that they didn't get an invite. It's not that I purposely missed them out, but it's how its always been that we always do things seperately with each group, and as far as I assumed they had plans anyway. Things was said, and I explained sometimes them lot do things and don't invite us but we're adults and that's what happens. 

I feel like I've been sucked back into high school times, and feel like its 15 year old me and something daft.

Am I the asshole? 

not inviting my friends