Please help i need advice

My boyfriend says he has sexual fantasies and desires and they are like things like having 3 somes 4 somes and he wants to set up a gangbang for me. Also he wants me to suck other guys dicks and even do things with other females. I honestly don't want to do these things, but if I tell him no he gets extremely mad and upset and says he never gets what he wants that he is always giving to me and junk. But in reality because I can't work right now he only gives me a $20.00 allowance and which I don't spend on my self I save it for him in case he needs to get anything. I do without on things I want and need so he can get his cigarettes and buy his pills. All i want is a man to love me and not include anyone else in our relationship it makes me fell useless and worthless to him but if I say anything it makes him mad and upset and he whines about not getting anything he wants his fantasies and desires to include others. I love this man but I am not in love with him. I also am 5 months pregnant with his baby and I don't have any sexual desires right now at all I just want to be left alone and then he gets the idea to go on meet me and look people up so he can take me with him and watch them fuck making me fell worthless and if I tell him no it's an argument. All i want is to be loved by one man but I sacrifice my happiness for him. And when he takes his pills he gets worse and expect to do something that day.