How do I know when enough is enough?

I think for many of us, when we are asking this question, the answer is, "when I ask myself this question, it is already time".
It is safer to ask the question than answer it.

I've never looked back on a relationship and said, "Geez, I left too soon."
Every.single.time. I have said, "I'm glad I left."
I wish you peace.