Uni drama bc i don't have anyone to tell this to

So for context i know this one girl (A) since entrance year and we've gotten in classes together as long as our schedules match (we're in our 4th year). Theres two classes we didnt take and she met B & C from one and D from the other class. And i met a girl E on one of the two I took.
We're taking this anual class all together, 6 people in total. We hang out together and share some other classes too.

Yesterday they announced the last project of the year, a group project of 4-5 people. I saw them talking with E so I thought they told her "Hey we're making the group with just us". I guessed that was gonna be the case anyways (since they worked on a different class together last quater), but today I talk to her and she went into our group chat instantly to ask how are we gonna divide ourselves, then I told her how they already posted their group and ask if they didnt tell her.. they did not

I see A and B today since we have class together, neither said anything. I go back by train with B bc we take the same route and I mentioned how I was gonna asked in the class chat if anyone has a spots left. Then she brought up E and I mentioned how I assumed they were gonna worked together but thought they mention it to her and how thats why she asked in our group chat (which, btw they all just left her on read).

I made a few jokes abt how i also didnt actually "knew" and found out today when they added their names. it was rlly just teasing her abt it bc, AGAIN, I expected it but I did feel bothered abt E not knowing anything and thinking we're gonna work something out

We get on the train and is 25min of her talking in WhatsApp with A, rlly long texts. I caught a glance of A saying "DONT CONFESS ANYTHING" (???) And another of B saying how we're a group to pass the time in class

I mean is wrong that I expected them to mentioned it?? Like at all??

E and I are both autistic btw, she's the more dense unbothered type but im famously known for not understanding the different levels of "friends" so maybe thats why? maybe im not exactly friends with B, C and D but I thought we aren't just acquaintances with A to be talking like that abt me ig