Hello I Am 32 And I Am Religious Person .

hello
I am 32 and I am religious person . I have a boy friend.. he is 32 .. we meet each other in Singapore and we hav e been together for 4 months and after that I went back to my country. I am from Iran and muslim and he is from India and hindo. Hw applied for my Australian visa to come here. I had sex with him but not completed .. I cant accept to have real sex whith man whome I am not sure I will marry him or not.. every day we have fight for this he wants sex.. he is a nice guy and he try to persuade me to get marry to each other but in some case we have a different culture and different habit which some times he doesn't understand what is my initial feelings.. we saty together here for nearly 2 months..and in some case I cant get the feeling of my man in him.. just as a family member I can accept him but still for marriage I cant accept bcz of cultural differences and my feelings.. he is very supportive but still I have same problem .. when sometimes we are together I don't get that feeling of fulfillness..please help me what I should do