My roommate n I found a Home 13 years ago in MI She paid 13,000for home. Our agrt. from that time on was to split all bills 50/50. Ipay3/4.can I be ev

My roommate and I found a modular Home 13 years ago in MIchigan. I negotiated the purchase with the complex and She paid 13,000for home. Our agreement . from that time on was to split all bills 50/50. This was verbal. I recently saw proof that I pay two thirds to 3/4 of all the bills, for the last 9 years. Plus buy all house hold necessities. The main reason why I am concerned is she is a full blown alcoholic who drinks 24 hours a day at least 20 days a month and chain smokes . 50 % of the time she isdrinking she is fine. The other 50% of the time Something Happens and she becomes someone else. That other personality is angry,mean,cruel,a bully and threatens me that she is going to have me evicted like she is the landlord and I am just a tenant. I don’t drink or smoke and find ways to stay away from the smoke and being around her when she gets that way. Do I have legal rites?