I understand where you are coming from a failed relationship! In reality, you were in an abusive relationship. Praying is a great help but it does not mean that the Jehovahs Witnesses are God's choosen religion, the truth.
I hope you study the bible like the KG and many other bibles to understand false doctrines of the Watchtower.
Some times people make poor choices and when they start making better choices their lives changes. Better choices such as do not date someone who is abusive toward you and your child, choose to not be around people who lie, drink too much, or do drugs.