I'm so sorry that you were right about your "gut" feelings. That must feel absolutely terrible. As mentioned above, my boyfriend has told me that he is not in touch with her (other than to wish her happy birthday), and he has not publicly responded to her posts with friendly comments or even a "like." Of course, he could be doing all kinds of things in private but, for now, I will believe him until there are red flags other than HER behavior. Culturally, he believes that talking about exes is tacky and somewhat irrelevant, but I've let him know that I'd prefer to be aware of any exes that he has an active friendship with...I've also told him he can meet any of my exes and/or ask me any questions that he may have. He's met one or two but never asked any questions about the relationships themselves. It's just his way.