<human>: Can you give me the gist of the text in a nutshell?

I'm in a serious quandary here. A guy I'd been friends with for 10 years completely screwed me over recently and disowned me. He did it with no emotion and no regret, immediately moving on like the whole friendship never happened. 

I don't want to get into all the details but the short story is we ran a business together, I helped him set it up and did countless hours of free work, once the business was established and he'd gotten what he wanted from me he tossed me aside and cut me off as a friend, using ridiculous self-contrived reasons as an excuse. It was an incredibly toxic and abusive relationship (not physically, but he was a master of guilting me into doing things and constantly making me feel like shit for things which weren't remotely my fault or as bad as he made them out to be), and while overall I'm kind of glad that it's over, like a victim of Stockholm Syndrome I'm still somewhat saddened. I guess giving 10 years of your life to someone will do that.

My problem is that now that I know his true colours I almost feel obligated to tell people. I see him using the same manipulation tactics on his new "friends" and want to warn them of his true nature. But at the same time I feel like it would just make me come across as the bitter ex-friend or that people simply wouldn't believe me. Because isn't that the greatest strength of a sociopath - that they fool everyone around them into believing something that isn't true? Still, I know I personally would've liked some warning from someone when I started this relationship. Even if I didn't believe it I would've at least been aware of it and probably been more open to the obvious signs.

What do you guys think? Is there any point to warning people ie. making a public Facebook post about this guy? Or will that just make me come across as grade A crazy? I mean... how do you stop these toxic fucks?

I feel like simply moving on is like burying Jumanji and letting some other poor sap deal with the curse. Doesn't really seem fair.
<bot>: Was cast aside by friend of 10 years, turned out to be sociopath, should I warn others of his true nature or walk away and never look back?