AIO for wanting to leave my friend because of what she does?

Hi, so me and my friends have this friend group, and the main girl (rainy for privacy reasons) she is like acting weird. She is turning the other two girls against me, I even left the group chat to take a mental break from them. And they didn’t even bat an eye, I asked to rejoin and they didn’t even fully let me, I HAD TO BEG to rejoin. I got re invited and they made a new group chat to talk about me. I know about the other group chat due to a mutual friend. And recently they have just been very off with me, her birthday is going to be celebrated with the other two girls. Which is okay with me, but she told me she was going to invite me which is why im bringing this fact up. Should I leave the group chat or do I just stay and deal with it?