To not invite everyone out?

[Gerberama]

I work with 18 other people and we occasionally go out for meals/drinks, usually at Christmas or if someone is leaving, etc. I have become friendly with 2 of them and we arranged to go out one night for a couple of drinks, just the three of us. However, one of the others caught wind of this and thinks we should invite everyone. We just wanted a quiet night for the three of us to catch up as we get on well, and I don't see why we should feel guilty for not inviting all the others. Aibu?

YANBU

You not bu but you may risk upsetting hurting people.

YANBU. It would BU if everyone else went out as a group and only a few people were excluded. Only a few of you are going out, you shouldn't have to invite the whole office just because you met there.

Do you think that this person is really concerned about whether EVERYONE is invited or is it someone who might have thought that the 4 of you were good friends and feels it personally. How many threads on here are about "I thought we were all mates but I'm being left out/ sidelined"?

It's not being unreasonable to see just a few you are friendliest with.
BUT one of you is obviously chatting about this in front of others (or how would they know?) which I do think is unkind.