Need Advice pleasseeee?

A friend is a friend. That means being there for you no matter who they hang out with or who you hang out with. I think they are both inconsiderate and you shouldn't act okay if you're not. If I were you I would tell your friend exactly how you feel, then if they still create some kind of alliance against you, I wouldn't try to be their friend. I would move on, even though it may seem difficult.