I (f27) am the only single girl in my friend group of 5 girls. We have been close friends since highschool, and recently they have started getting into serious relationships, although I have only met their boyfriends a couple of times at most and never as a group with everyone together. One of the girls who recently got into a relationship is organising a vacation and has suggested that all the boyfriends are invited, meaning I will be the only single one. While it is a nice idea, I am feeling a bit of reservations going as I am not particularly keen to be the 6th wheel on a couples trip, but at the same time I don't want to seem unreasonable. Does anyone have any similar experiences or suggestions on whether I should go?