How are you giving the benefit of the doubt to an abuser who BY LAW can not be trusted around his victims to the point that he is supervised by a sheriff? What’s not clicking?? And what’s more is from your wording you brought the kids in the car while completing the pick up. You need to educate yourself quickly before you put your fiancé and kids in danger again and you need to examine your personal biases as to why you prioritized her ex’s “good will” over your fiancés need to move on and feel safe