I really feel for you. I have been in a very similar situation several years ago. We did lose everything, cars, house, each other for a while. It was awful but we got through it, we both got back on our feet and after about 18 months we got back together. that was 11 years ago. We have two children and at that time I was laid off from my job and he lost his as well. I had to go to social services, salvation army, anybody that could help me get back on my feet and help me feed my children. I did find another job, found a cheap but clean place to live. It was hard but when I look back now, I realize how far I have come and that we are so much better off. We learned alot of lessons about money and what is truly important in life. I dare say what would have happened had we continued on the path we were on. Please know that things will get better and financial strain on a relationship is very hard to deal with. Please get some help with your depression. When you feel better it will be easier to put your life back in order.
Take care, my prayers are with you.