You have interpreted what Jesus said, just as the Church did.  It took them 1000 years to come to the conclusion that there should be a "sacrament" of marriage - before that, it was more a legal arrangement.  Perhaps it is time, after another 1000 years, for further "development".  Take a look at what the Orthodox Catholic churches do, what Protestant churches do.  They are interpreting the same thing as you and have found/are finding different answers.