What to do when you encounter senseless aggression?

A fellow has chosen to sink to childish public gossip and putdowns to ruin a really great thing I earned. What can I do to put a stop to it without making a scene or a big public wave of contention? I'm more interested in preserving my reputation than anything else.

It's bugging me bc he's being very sneaky about it and resorted to having female "friends" act aggressively towards me in generating the smear campaign (public ridicule and call-outs to shame me at work events, chat groups to discourage others from partnering with me, etc.). I was losing contacts and support v unexpectedly for months and didn't know why... and someone who knows me finally called to warn me that this is going on. He's stalking anything related to me online... it's really creepy.

Full disclosure is I shut the guy down for mistreating and disrespecting me in the past, then I walked away. I hadn't mentioned it to anyone in our circle other than ONE person who tried to confidentially mediate the situation. Now he's claiming so many fake things, even using the mediation against me.

What to do when you encounter senseless aggression?
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