Re: What to do ?
No, no, he has not been violent against women in the past. And in the dojo nor "really" violent against men. He has been reported to the police (and got punished by the court) for other things (betrayal), not for violence. It's more a strange, hard to describe "aura" around him, that can be very scary. Usually he is very nice, very charming, friendly, a good person, nice to talk to, nice to be with him, wonderful to train with. But he has also a dark side, that you sometimes (very seldom) can see for a short time. He has a lot of temperament, is very large, of enormous strength and a very well trained martial artist. There are other men of his size/strength at the dojo, but they don't have this "odour" of potential danger. I could describe it better in my own language. It's as if there were something in him, that is so very strange, not really evil, but strange, that no one can have contact with this part, not even he himself.
But these are only feelings. Maybe they are wrong and very unfair against him.