> Yesterday, the therapist I am going to mentioned that my SO is the one that maybe needs therapy too. And is treating me unfairly by making me be extremely tough on myself, changing the perception that I have of myself.

there is your answer right there.

> don't feel safe in this relationship anymore, at the same time I don't know how to go from here. Or even how to end it.

"hey, its over..have a nice life"'..then you block the person and move on with life...no need to send me any reply back with endless reasons why you can't do this.