I've had a look through a few threads but am otherwise new to the board. This is the first place I thought of for impartial advice, having had some good advice on the in-laws board.
i'll try to keep it short and explain as much as I can.
My mother and father divorced 11 years ago. She met another man a year later, they moved in, but did not marry. He was an alright guy to me - I was in my early teens at the time - and we did some stuff together and I was also a bit of a stroppy teen at times - it seemed pretty normal. Unfortunately, he died of cancer in 2004, and my mother was alone again. She then met one of his friends, someone I'd only heard not great things about. I'd moved to college at this point and he moved in with her, so the first I met him, he was already living in my home. It was odd at first, and never stopped being odd. He was and is an alcoholic, has drug problems - including harder stuff - is part of a biker gang with a violent history, and has mood swings that don't seem to be triggered by anything. The first thing that worried me was the first time my boyfriend came to stay with me at our home, my mother was fine with it, but he decided to start a fight with her. i was trapped in my room with my bf, too scared to go out for all the shouting, swearing etc. Eventually it went silent and my bf had to go back home, but that's when I realised things were not 'normal'. I was scared to be there. I got to go back to college and tried to visit home less and less. Once I had to go home with my bf and my mother's partner would not talk to me or my bf. She told me that he didn't like my bf, because he hadn't said hello immediately when we arrived