My tenants are divorcing and one has moved out, what should I do?

[Erik Halsey]

I'm a newbie landlord in Graham, WA and these are my first tenants. They both signed a 12 month lease which will expire in October. One has already moved out and the other plans on staying, even after the lease expires. What should I do as far as the lease that was broken? Do I need written statements from both parties? Write a new lease? Also, the one that plans on staying isn't the one who was earning the income for the household and I am worried about the ability to pay rent. Any advice will be helpful!