If you stay it only gets worse
If you end things and go NC it gets better.
You start to see how horrible they were to you. See things clearly... you start to let go and see how much your love was blinding you to their HORRIBLE actions.
You are free of their manipulation and lies and you start to see things for how they really are.
I still panic over the notion of being alone. And I still feel very lonely.
But I have gotten to the point where I realize I am much better WITHOUT him then I was with him. And I am happier not talking to him then I was talking to him when he could guilt trip me and make me feel awful about myself.