AIBU to ask friends this?

[mightyducks]

I am organising an event and had space to invite 4 other couples- I decided to invite 2 friends first and both accepted- that left 2 places left- I have a chat group with three other friends so messaged to say I had 2 places left. 2 friends accepted and the the third friend messaged to say that I had been very unfair to invite 3 people if only 2 could go and that I'd really upset her and she was leaving the chat group. I messaged to say we could organise extra places but she was having none of it. Was it terrible of me to invite 3 couples for 2 places?

I don't think there's anything necessarily wrong with offering the way you did, but if the dynamics of the group are that this one person gets left out in lots of situations, then I could see this sort of thing being a final straw and a bit unkind. If things are normally quite even with things going back and forth between everyone, and it all comes out in the wash, then it's bizarre that she should have taken so much offence.

Did they have to be couples? Couldn’t you have just invited the three friends without their partners?