Moving on from my ex, and now she's trying to make my life miserable?

I recently went through a very difficult break-up. It's been a few months and I'm slowly getting to the point where I'm moving on from the relationship. I'm not entirely over her, but I'm enjoying being single again.

The problem is: ever since I stopped trying to pull her back into my life, she's started spreading rumors about me to all of our mutual friends.

I realize that if I was over her, this shouldn't bother me. But, we had known each other for a while before we started dating, so it's kind of messed up to act like this. Before anyone tries to make me seem like a jerk, she dumped me and I never cheated.

What's her deal?
Moving on from my ex, and now she's trying to make my life miserable?
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