I am glad to read your post this morning
Communication is the key and its making him see. Just keep expressing your feelings. Trust me there is nothing out there. I have girlfriends my age 50's who are on third divorces and are bitter women. Some have regrets of leaving their first marriages years ago. Remember the grass is not always greener on the other side. You find it hard now with a husband, forget it when he is not there you will be on call 24/7 working , paying bills taking care of your son.
Just think it through and give him a chance see what happens.. Good luck!