In the end, he drove away the people he loved, leaving only the job to keep him going. But even then, he still wanted to provide for his family first.
There's not a clear moral arc there, I don't think. You can't point to any single decision and say that was where he went wrong.
Also, the show was particularly disturbing, not in the violence and criminality, which are priced in from the premise, but in the attitude toward sex.
Every time anyone does anything sexual, it's a manipulation towards some other end in a really nasty way.