Well, I can't speak to the cultural differences; that's outside my area of expertise. You might do well to find a marriage counselor who is familiar with those kind of cultural influences.
But those kinds of cultural mores can actually make a situation worse if one spouse or the other feels like they "have" to stay married to keep up appearances, raise kids, please the family, etc.
Your situation will only really heal if you and your H can learn to live together again and choose to love each other. That is not something your BIL can do -- for you or for him.
Me: 44, Wife: 39 M: 17 years T: 20 years Bomb on 08/25/09 1/13/10: MC started 1/28/10, 2/8/10: More bombs 8/28/10: Wife moved out No talk of D, no movement