Friends talking behind my back

I have had the same friend group for 3 years now and now we r in 9 grade. I thought we were all really close but apparently to them are friendship is “complicated” that’s what one of my friends said after a girl asked about me. I thought we were best friends. My friends accuse me of doing things that I never do, think I’m a liar(I’m not) and use for what I have. I thought about switching friend groups but for some reason u still love my friends. What should I do?? Please help!!!