Plz help !! i love my boyfriend dearly. hes a 38 yr old lebanese man?

and i see him as often as i can. However im in the UK hes in Saudi working. lately hes been really possessive. demanding to know who i talk to, phoning me , and leaving messages that he knows im cheating on him..when im not. , and worse,,,he wants frequently, and to be honest i really dont want to do it on a webcam. this of course to him, means i dont love him, and today he told me..that if i were to be his wife ..the way i am,..he would have many problems with my attitude., coz if hes my man i must do as he says.....i really cant cope with it. i love him, i love his family, and especially his mum, but hes really dragging me down..i spent the last 2 days unable to eat and in tears ..please help.its like hes taking away every bit of strength i had. thanks xx