We're seniors in undergrad/1st year grad students now. In high school around junior year, our crew really solidified and we began having a groupchat. As time passed and people changed, we continuously made new fb messenger chats (to phase people out) and eventually crossed over to groupme. We ended up with a guys-only chat and a full-squad one. 

The guys chat is pretty much just memes. The other one is a mix of memes and social planning. The past few years we've had two main events that we strive to get everyone to for a "reunion" since we all go to different colleges and schedules: a trip to a friend's lake house at the end of summer, and my christmas party. You could say these are always prone to everyone getting absolutely hammered/high (especially the lake trip) but it's really not a big thing and no one is pressuring anyone other than the usual "c'mon man we should do one more."

Christmas 2016, the friend in question here, we'll call her Karen, leaves early (everyone else stayed over). Karen was best friends with my girlfriend since high school (maybe even before). She was always more of a mom figure, and no one minded her leaving since we still got to hang out with her, do secret santa, etc. From this point on, she begins to become noticeably more distant and says much less in the groupme, but still maintains a steady friendship with my girlfriend.

Shore Party 2017 at my house, Karen attends for about an hour with her "boyfriend" who she also broke up with at the same time and then left. We were down there for 5 days having a high old time, but she showed for truly no more than two hours tops then left. One of my best friends brought his girlfriend and everyone else was excited to meet her and we really hit it off. In fact she's more or less taken Karen's place in the circle since she's been gone. 

Lake Trip 2017, Karen did not attend. And it's worth mentioning that during the 2016 trip she was quite distant, always separating off with another friend. This other friend (lets call her Julie), Karen, and my girlfriend all are (were?) besties. 

Christmas 2017, again, no appearance from Karen. At this point, the friendship between my girlfriend and Karen seems to still be very intact despite their growing apart a bit. They hung out over christmas break and whatnot. From this point on, Karen says almost nothing in the groupchat. No memes, no response to events, nothing. Maybe like 3 random pictures.

My 21st Birthday 2018, Karen has already said she isn't going to the lake trip in august. She hadn't attended the surprise party for one of my other best friends earlier that summer, nor any other gathering we had between now and Christmas. In fact, we had managed to see one of our navy friend who was away at Marine OCS more times than Karen. 

Already being fairly lit, someone suggested we truly remove her from the chat (we ban people comically all the time and re-add them for meme reposts, general stupidity, etc). I took the liberty of posting a ban hammer yugioh card meme, at which point my other friend uses my phone to ban Karen from the groupme. I took responsibility since it was my phone. 

An hour or so later, Karen texts both me and my girlfriend. I don't have the messages anymore, but it was along the lines of she was truly hurt and thought we were all best friends. I ignored this (and also thought it was bullshit) until the next day because I didn't feel like having her drama ruin the party. 

My response was essentially: *I believe I speak for the majority in saying that you've been distant and don't seem like you like hanging out with us. If I've misread you, and you want back in, by all means say the word.* She pretty much just said "no, I know when I'm not wanted" and that was that. She was fishing for a fight/apology and I wasn't about to give it to her. The vibe I got was she was mad we had broken the last bond between us all instead of her. 

In addition, this lead to a bit of a fight between Karen and my girlfriend because she didn't stand up for Karen to everyone else. After reading their conversation, it was apparent to me Karen had been jealous/judging my girlfriend's success/lack of working over the summer, and this had been brewing for a while. Obviously my girlfriend was pissed/upset about that since she has worked very hard and deserves all she has achieved. Ever since they've been quite rocky as friends and IMHO it's time to move on, but that's not for me to decide for the two of them. Julie and my girlfriend are still best friends, and we all love hanging out with her. 

So almighty judges of reddit, I'm curious, am I the asshole? 