O....M....G! I can totally relate girl! My husbands exwife has launched a campaign to 'publicly humiliate' me, whatever that means. I also struggle with wondering how to react or not react. I hate that it appears that I'm a doormat or am weak. Have you looked in to restraining orders? I agree with blocking her from social media. I did that too and then blocked some of her friends who were lashing out at me. It's rough and I don't have any great answers, but just know there are people dealing with the same crap