Whether what you decry is fundamentalist or simply mainstream Catholicism, the burdden on you is to show not merely that Jesus meant something other than what he said re: divorce, but that he meant the opposite of what he said.   He said that marriage is indissoluble except for infidelity.  That's taking him literally.  Now, how do you get from there to what you espouse --- that what Jesus intended to say was the opposite, that marriage can be dissolved for reasons other than adultery?  Isn't the truth a lot simpler than your inverted reasoning?  That Jesus gave us a hard rule that you, regarding the rule as too "First Century," are simply unwilling to accept?