LW1 - you may be educated but you lack common sense. I most certainly side with your parents who have more concern for you and the safety of your child then you do yourself. You can continue to date the guy if your so smitten but don't move him in. Your son needs your full attention. Co parenting with an abusive ex is going to be challenge enough and I hope he does not harm your son. Make better choices going forward. You can do this!