Ask yourself - is it worth arguing over? Make your feels known and ask to be invited next time, then accept it and move on. No use arguing and dragging it out, that will just hurt both of you even more.
Iām sure there was no intention to hurt you, those who invited him probably just wanted a boys trip, he may not have realised it was this important to you.
Also it is important for guys to hang out without their partners there, and same for girls to hang out without any guys around.
I think itās understandable that youāre hurt, but donāt see either one of you as right or wrong personally.
Itās not how you feel that determines if someoneās in the wrong, but how the person thatās feeling them reacts to those emotions.
Thatās my view on it anyway. :)