So this situation involves me and 3 friends, I'm just going to use first initials.
I met up with S for dinner this week, she told me that she had plans to have drinks with A (who neither of us have seen in many months) on Saturday, would I like to come along if A was ok with that? I agreed and told her that another friend, T had previously asked to do something with me on Saturday and at the time I hadn't been sure if I was free and so said no, could we invite him along too? S was fine with that, said she'd talk to A and let me know.
Today S messages me, says that A was fine with me joining, I asked about inviting T, she said I could and I did.
S then messages me to say that A didn't want T there. I had assumed she'd asked about him when she did me but she'd forgotten and then just assumed A would be fine with T coming too and didn't ask me to wait for her to ask A.
Now as far as I am concerned these were A and S's plans. I've been in A's position before and felt obligated to say that other people can join in on plans when I would rather they didn't and I ended up wishing that I hadn't gone out at all. S and I were in agreement that saying T was coming anyway would just make everyone uncomfortable.
So I had the awkward job of calling T to explain, asking if anything had happened between him and A to explain why he wouldn't want him there (apparently not?). I apologized for the situation, offered to make arrangements for he and I (and possibly S) to do something separately on a different day. T said that he was upset that A didn't want him there and the rest of the call was spent with him trying to think why.
Over an hour later I get a message from T saying that he is pissed off with me and S because we are treating him like a "second class friend".
I explained that this wasn't originally supposed to be a group outing, that they were A's plans to start with and if he isn't comfortable with T being there then it's unfair and disrespectful for us just to bring T along, I explained being in A's position etc. Everything that I've put in this post.
And the response I've got is "I can see it from your perspective you're just wrong."
If A had said that he hadn't wanted me to join I wouldn't have had an issue. I can understand T being upset about being invited but I really don't see what how doing anything else would have accomplished anything but extreme awkwardness and an unenjoyable night out.
AIBU? What would you have done differently?