Can I cut off my best friends girlfriend from my life?
Why do you want cut off your best friend's girlfriend?
She made my best friend cut me out of his life.
Even if she is doing things to harm your relationship with your best friend, it would not be good to harm his relationship with her. He might choose her and then you will have no one.
I already do since he's accepted his fate and will not fight for us.
You should still try to talk to him and avoid loosing everyone.