What was said about you and how long did they smear you from the best of your knowledge?
My ex began smear campaigning me to mutual friends already before the discard (this I learned only in retrospect). It lasted a few months more after the discard, during which I withdrew entirely from the group. It was after those few months that the group started realizing who she is and, one by one, started to pull away from her. They had not only started to sense that what she was saying about me wasn't true, but they each had their own experiences with her less than favourable behaviour by that point too.
All kinds of things were said about me - from distortions of morsels of truth, to outright fabrications.
One of them was that I have OCD when, in fact, it is my ex who is diagnosed with and on medication for OCD (as well a host of other comorbid mental health disorders).
Another smear came after a rage she had. It came suddenly, unexpectedly, and was very violent, as she hit and slammed things, stomped about, and cursed loudly, until she stormed out of my apartment to meet our mutual friends for a celebration we were to go to that night. I said not a word during the entire episode. I remember just focusing on remaining calm, breathing, staying out of her way, and letting her do her thing, and not take it personally. I was never an angry person, and most certainly never once so much as even raised my voice at her. I had also never had anyone blow up like that before. I had no idea what was going on. Naturally, after she left, I entered a mini state of trauma in which I was initially numb, and then started shaking. I was so utterly shocked and confused over what just happened. I took an hour to muster the nerve to still join our mutual friends at the celebration to at least show my support for the cause (though I didn't stay long), where she had already been sitting happily laughing and socializing like nothing happened. I later discovered that she had spent the time before I arrived, telling them that it was I that had just been raging and violent towards her.