Jesus proscription against divorce is based on reasoning that is not time-bound.  The first link in Jesus's reasoning is that God made man as man and woman as woman, and for "THIS" reason --- man's creation as man and woman's as woman's --- they marry.   Further, because God himself hath joined them together, no man can put their marriage asunder.  Frankly, I don't like that teaching either.   But, then, I'm not God or Jesus.