Jesus was calling us to understand and live the spirit of the Law, rather than merely to observe the letter of the Law.  
Of course, it is a very difficult teaching, to live the 'completion' of the Law, about which Jesus spoke. How many people do you know, who have plucked out their right eye? Or who have cut off their right hand?
Not many, I think.
His intention was to make the Pharisees think about the Law.
And, as part of this, He was trying to protect women against being divorced for poor reasons.
What He wasn't doing, though, was creating any new burdens for the people. It was the Pharisees who did that - as He said (Matthew, chapter 23):- "They tie up heavy burdens and lay them on people's shoulders".