Protecting you and your children financially is most important. Don't worry about whether your h would not want you to struggle- it's a non issue what you think his intentions are. You did say he was a poor money manager so all the more reason to protect yourself financially.
Making sure you have a roof over your head and food on the table is not R talk. Focus on you and the kids. Good luck on the job search. A book I used to love is called " Dare to Win" (cheesy title- great book).
It will get better:-)
3 kids BD 12/15/13 (IDKIILY. ) Rope dropped Cirque du Soleil style D final 9-9-14 "Some people are born on 3rd base and go through life thinking they hit a triple." Barry Switzer