When u know from the start ur bff is dating a cheater..

Has this happen to anyone? My best friend began dating this guy and I knew from the very beginning that he was full of crap, that he was a liar and a cheater. Im really good at judging people and their character, I've always been that way. There had been times during their fake relationship where I felt like she was going to choose him over me because she didn't like the things that I would say. Well in the end after a year of her being the side chick she finally found out the hard way. Now that they are finally over I just feel like our friendship is different. We don't talk as much. I haven't brought this up to her. Should I? How should I go about it? I just hate the way that she was when she was with him. She's super insecure and she's the type that can not be alone.