My irl friends are being weird

So lately my irl friends have been super weird. Actually, they've been weird for quite a while. Our gc has been super empty for months. Apparently, that means they have one without me. I didn't wanna believe it but the evidence is undeniable. Back in May, I glanced at my best friends phone and saw a group chat called "Urnebesno" (That means hilarious in serbian) And in the gc are my best friend, my other friend and some girl who pretends to like me, I'll call her fungus coz she'll be relevant. Idek why fungus is even in our friend group. Like I genuinely think just ONE person in the entire friend group likes her, my best friend, but even she talks shit about her. I got into an argument with fungus, in which I called her out for her passive-aggressive behavior towards me. The argument didn't do anything, she gave a fake apology only coz she had to and I said I wasn't gonna hang out with her. However, she must've forgotten or thought I was joking because when she invites me out I always decline. Back to the gc thing, I don't know what I did or if I even did anything. The only thing I can think of is me reconnecting with a childhood friend, but I still hung out with them just as much as before. I tried talking to them but it never leads to anything. It seems like they don't want to face the truth and ignore the problem, as if it's gonna fix itself. Does anyone have some advice on what I should do?