What Would You Do If You Experienced Great Cruelty And The Inflicter Was Rewarded By Society, And You Punished?

My ex always talked badly about his ex-girlfriends – one was a “psycho” another was too ugly, another one was mad, etc. When I dated him I discovered that if they were, he must have made them so – he is the most cruel person I have ever met. I didn’t even know that people like him existed.
He would deliberately manipulate all vulnerabilities putting women in the worst possible situations, and could get away with saying that he was “joking.” For example, once when a girl confessed that she was in love with him, he announced it in front of mutual friends and laughed in her face. With one girlfriend he slept with her room mate – a friend of hers. He brags about it, and laughs. Another girlfriend had been mugged at knife-point and is afraid to go down alleys, he likes to tell about how he pretended not to notice her distress about going down the alley, and sent her on her way while he chatted up some girl.
For some reason – because he has charisma, and is giggly, people other than his exes think he is just being funny – no one thinks about the horror he inflicts on women. For example, while dating him, he announced to a table of us while eating, that he should date other people.
It’s the sort of stuff that you think you’d yell about and be furious, but in reality you literally cannot believe that this can be happening – that they must be upset with you, or have a bad sense of humour…you try to figure it out. He then tries to make you believe that you are paranoid, imagining things or overreacting. Luckily i kept catching him out lying, and lying and lying, (and doing it so well) and finally he admitted he had meant to be horrible – and laughed about how he’d made me unhappy. When I said he was a nasty piece of work, he confidently said he wasn’t – even though he has cheerfully recounted endless tales of spite, with a chuckle.
The thing that angers me is that I feel he has gotten away with it. He snatches away women’s confidence, they feel insecure, which makes him more contemptuous and behave worse. And you feel so insecure that you think – he must be right – I’m just being paranoid. Even though you weren’t with anyone else. No one sees through him although they wonder about his sincerity since he always bitches about people behind their backs – but people think – oh about everyone EXCEPT me! Nobody except his exes. Everyone thinks he’s good fun.
He has this routine – he pretends to be really nice, so women fall for him, then he gradually slips in spiteful comments, and tortures them. Ocasionally being sweet so that they think there is hope. All hte while he is laughing at them. I explained all this to a friend of his, who congratulated me on my insight and agreed he was completely ****** up, however he told my ex -who was furious with him, and told him never to speak to me again – so he didn’t. He tried calling me, but he’d already betrayed me by going back on what we’d admitted.
I haven’t seen him in months, nor do I wish to ever, but I will never accept that this person should get away with it. If you could lock people up for physical abuse, why not mental abuse? I’ve been put through hell – and for what – for just trusting him, and being affectionate and kind. I am disgusted that he has gotten away with this. He has a good job, a group of laddish friends who don’t analyse him too much – and recommend that i don’t (so he gets away with murder) and a girlfriend who spends all her time worrying to him about him and other girls, and getting cross with his selfish nature. She used to be confident. I can’t warn her as he winds her up about me – her biggest fear is that he has feelings for me. Silly girl – he hasn’t feelings for anyone – not me, or her – as he admits (one on one – no witnesses). He’s also bisexual, and thinks nothing of cheating on women with men – not that he admits that – but I overheard him once….just another example of his dishonesty.
So life is good for him – and he never suffers from guilt – like so many psychopaths….he’s gotten away with it – again.
What would you do in my position?