Hun, first of all, you have evidence that he "likes" that sort of thing... so technically I believe you. I really do. I hope that if he ever does try something.. you would be able to just say no. I can tell you've talked about this before because you think no one will believe you. I don't know if maybe you are just having anxiety that he might do something to you, or if he's actually acting that way, but I am leaning towards acting that way for right now. I don't know much about you, but to me it seems that you should try to not stay with him alone, and if you feel like he's going to make a move, call a friend or something, get out of the house for a while. I can only imagine what an emotional toll it has taken on you!!! Maybe you should try and take a mini-vacation from your family and try to relax too... it might help you be more clear-headed and able to make quick decisions if you need to..
Well I hope I had some sort of advice in there... if not, I am sorry. :/ I hope you move out or something..before anything real happens!!! Talk to me anytime and I will listen I promise!