I am so sorry you are going through this.
Remember you have rights and he can not just "cut you off".
Get a lawyer...quickly.Find out your rights. Uou may not have to re-home your babies or assume all the debt.
My ex left me after 10 yrs of marriage with a 5month old and a 4 yr old. You have rights. He was there one day and gone with his bf the next.
Things will get better for you. I am living proof of that. His leaving us was the BEST thing that ever happened to us.
We have a MUCH better life now. You will to.
Get a lawyer. My loving DH is a lawyer. Not the kind you need though but he would say get a lawyer now.