
Honestly in situations like this people tend to exclude certain people on purpose that aren’t ideal to them to hang out with or include in group activities. If you’re confrontational you can ask them about it or choose how to navigate it but personally I would take a step back from a friendship with all of them if they’d exclude you like that
Thats grounds for divorce omg It seems that the plans were already made without you in mind, maybe ask or communicate on why that happened, but even then, I don’t think they were ever going to mention it to you. I’m sorry for the things you are going through, and I know it’s tough but you oughta find better friends
If you’re confrontational I’d would ask them why they didn’t tell you about the Vegas trip. And specifically to your one friend why she never mentioned the Vegas trip to you KNOWING that you wanted to plan that whilst also knowing about what the other friends were doing. If you’re not confrontational then id suggest you distance yourself and make plans with other friends.