Depending on the type of guy your ex truly is, his apologies could be sincere or they could be complete crap. Follow your intuition on this one. My ex begged and pleaded and told me had had changed and less than a week later he continued his destructive behaviors that drove me away in the first place. They don't change for you, they change for themselves and typically they don't think there is anything wrong with themselves to begin with so.....just be smart and be safe.