Basically, relationships problem could be vary. As for your case maybe he is not prepare or commit to have a relationship, i mean i got to know the entire picture of your story as your verdict are limited as I'm a counselor it is rather difficult to advise you. Firstly you must understand that both of you are from different culture and different upbringing. So, not much of an expectation i don't find there's a reason to break up. Talk to him and find out the reasoning for breaking up.