There is no way to predict the future. A lot of violence in relationship takes months/years to appear. Plenty of violent and abusive people have no criminal record or red flags. And the ones who are really good at it... know how to manipulate people and tend to be very charming and attractive. There is no 'standard profile' of an abuser.

Further lots of bad partners only drop their good person act once they have reached a level of security in the relationship. I had one girlfriend who only started physically attacking me once we had reached the stage of moving in. Because she finally felt she 'had' me and she could be her 'real self', and that 'real self' was a terrible person and her fake self had been wonderful. Her 'feeling safe' with me was what allowed her to slap, punch, and kick me. She was totally shocked and BETRAYED that I left her for her physical abuse, because I was a stupid man who didn't understand that "I had made her really angry and she couldn't help herself because she loves me so much!"