What emerges from your posts is that you consistently have good intuition but you do not trust your own judgment and act contrary to what your intuition tells you. You could have been rid of this man a long time ago had you not second guessed your own judgment. Having a good intuition is an asset you can leverage. It is not that hard to learn to trust your own good judgment when you have. It would have been far worse had you not had good judgment; that is so much harder to fix.

I do not know if discovering lessons learned from this horrible experience is currently relevant for you, but if it is, I would propose trusting your intuition and acting in congruence with your intuition and not contrary to it as one such lesson.