What are my options if my spouse stays at the same house I am staying but has not paid rent for two months?

This simply cannot be a real question by a real person, can it? You think someone is going to take it seriously, because you are so distraught over the fact that the spouse has not paid rent. Get out of there, or pay the entire rent yourself, or convince the spouse to leave. You have no rental agreement with the spouse, have the landlord evict only the spouse you are still married to. Go ahead and fail to pay the rent, because the spouse can't, and then both of you will be evicted.