<human>: Give me the gist of the text in a nutshell

FWB = Friend With Benefits

The ex is Alice.  Our mutual ex, meaning we were all three dating before, and then because of reasons, there were breakups, and now it's just me and FWB named Clarissa.  Ex deserves to be upset, but this behavior is inexcusable.

Just this past week, I gave up on being "friends" with this ex.  She has been trying to convince me to break up with Clarissa for weeks now, and I finally gave up talking with her when she sent me with a falsified screenshot of a message (from Clarissa to Alice) implying something nefarious.  I decided I was sick of the lies, and explained that I was no longer interested in staying in contact.  I blocked her on every single digital communication medium I could (and her fake profile that she was using to get information from me).  Clarissa has done the same.

Alice most recently called in to Clarissa's place of employment, and claimed that someone fitting her appearance was smoking weed in her car in the company parking lot.  Alice then makes an anonymous Yelp post saying the same.  Clarissa's management took her aside privately and asked for clarification, and all agreed that it looked like someone was deliberately making a personal attack on her, so she still has her job.

I need to know when I can decide that this sort of behavior constitutes legal recourse.  Obviously, I can't take away Alice's ability to use a phone or internet.  If I got an attorney involved, would they say "until she actually causes provable damage to someone physically or to their livelihood, you have no case?"

I'm not interested in retaliating.  I already know that this individual thrives on getting a reaction out of people, and Clarissa and I are committed to not giving her the satisfaction.
<bot>: Ex is trying to hurt me and FWB because she can't have her way.  I just want her to stop.  I will not retaliate.