I have that tattooed on my wrist, "WWSdD?"
Its not a given number of times cutoff. Its more a matter of, "Fool me once, shame on you. Fool me twice, shame on me." Where "twice" is where the shame curves cross on the graph. Where your self-awareness kicks in.

" I can see clearly now, the pain is gone." Where it hurts more to stay than to go.