When this group thing happened, I didn't realize it. People who I assumed were my friends suddenly were getting together without me. I asked one of them what was going on and she told me that this person ( the one with the suspected PD) doesn't like you, so at least she was honest. I was upset and sad over this and didn't understand what was going on. I found out later that this person had done similar things to other people. She moved out of town but by then, friendships were ruined. It was a group of three women. The remaining two are still close friends. I am cordial when around them but keep a distance from them.
I have felt a bit envious of friends who have "girl groups" that they do things with but also now wonder how much of these involve drama that I am not interested in. I prefer to get together one on one with people or a group like neighbors if we get together on a back porch or doing something like a work out group. But some of my friends would do "girls night out" and things like that and I just didn't feel a fit with this situation.
After the situation with this group of women, I got busy with kids and doing things related to school and their activities. Admittedly, I didn't make the effort to socialize as much. I had a friend at work who I thought we were good friends but she left for another job and just cut off everyone related to the old job, including me. That felt hurtful but I don't think it was personal but about her not wanting memories of a job she didn't like. Still, I don't understand just discarding friends like that.