Is talking about quitting to your supervisor a point of non return

I have been feeling miserable about phd for a bit of time, and just started therapy. So far i tried not to take drastic decisions as quitting, because i know i am strongly influenced by my condition, but lately i cant think anything else. I wonder if its possible to convert my contract in a research assistance, or which is a graceful way out so to continue deserving recommendation, or which is an adequate resign notice period etc. But i know it would much better to finish the phd, and so continue trying. Is talking about quitting possibilities with your supervisor a point of non return?