I don't know what God wanted me to learn from it, but I learned to NEVER trust that snake again, and hopefully that guy learns to never try to invade marriages again by preying on weak-minded wives, which thankfully, my wife is not (This guy is 100% responsible for dissolving a troubled marriage that was fully repairable, by encouraging the wife to divorce, by sick twisting of Scripture; need I mention that this guy later became sexually involved with that woman?). I believe that sometimes the best thing is just to simply take things at face value and not try to find deeper meanings behind them. God revealed a poisonous snake, my job is to not get bit by it.
You know, you feel the same resentment toward that man that I felt in my marriage and until you come to terms with the face that you are resentful about it and give it to the Lord and until you realize and accept that God is 100% omnipotent and could have stopped it if He had so chosen, but allowed it for a purpose, then you will miss the lesson and the blessing.