Is he aware you feel like he puts you down in front of others?
Have you both considered counseling?
I wouldn't throw it out the window if you are having so many apprehensions.
I would highly suggest seeing someone who can resolve these issues and help get communication back up. 19 years is a lot of throw away, fight for it babe. A therapist might be what can save your marriage.
But if he doesn't budge, then say goodbye.

Good luck.