The day my heart broke

On October 23rd of this year, my world fell apart.  I had just spent two hours showing my child how a person in their life was trying to manipulate them and make them live their life according to that person's control.  My child is/was blinded and did not see it.  My child chose to go down a path that is uncharacteristic of them.  I know that I cannot live their life for them, but I just wanted to lock them up until they saw what I was seeing.  That child turned their back on family and friends in order for a season to be "happy".  I have questioned myself everyday since, what could I have done differently in raising my child?  Did I not love them enough?  Did I not show them the love of God enough?  What did I do to make this child this way?  I know that my child has free will to make their choices, but how did I influence those choices?  Was I such a bad mother that they sought out this person to fill a void?  Only God knows what is going on and how He is going to use it for His good.  I have to trust that, but my mother's heart still hurts.