I know what you mean OP. I'm sure there are people I'd never suspect but sometimes you just get a
feeling about someone.
There was a chap at a school years ago, where ds used to go, and he was a dad of a boy in our class. One time he marched over to our car in the car park to ask if my son had beaten up his son, or something like that - no evidence, just some crossed wires I think (ds hadn't - he]s never hit anyone apart from his brother!) and the way he did it - trailing his tiny wife - 'me and my wife' rt of thing. She did not speak a word.
He always came to school alone or with her and she was always silent when she was there. And he played the happy interested father, staying behind every afternoon to conspiculously play kick around football with his son. So everyone could see what a great dad he was, it was all about him.
I never saw her again. I used to wonder if he forced her to stay at home so he could be in charge of everything. I had no reason to think he was an abusive wanker, I just really couldn't shake that feeling
My friend just took up with a bloke as well, and I had a feeling he would be trouble, no reason really - and then I asked why his last relationship ended and she said he told her his ex had beaten him, locked him in a room and set his house on fire.
Immediately I thought, right you are. And lo and behold he's started being aggressive to her. They are weeks into it, she's pg, I feel like I should have said something.