You don't state how old the both of you are so the question is kind of hard to answer.
At one time, no one married outside of his/her culture, even in the US. Germans married Germans, French married French, etc., and you NEVER went against your family for fear of essentially being disowned.
That has changed for many people but not all. I have friends from India--two did the arranged marriage thing and the third (a woman) found her own husband. Neither set of parents objected in the last case. A Syrian friend of mine married an American with no problems in either family.
However, there are people for whom associating with, much less marrying, outside of the culture is completely unthinkable. Family = culture. This can put the children in a bad spot, having to choose between family expectations and potential future happiness.
If he's an adult, he must decide for himself which way he wants to go. If he doesn't choose you there's nothing you can do to get him back. I know you don't want to be alone (who does) but that is one of the risks in any relationship--regardless of culture.
He has to love you for who you are. If what's keeping you apart is stronger than what holds you together then it's time to go your own way.
What would you tell someone who came to you with this problem?
Good luck and please keep posting.
