Legal Question in Landlord & Tenant Law in Illinois

You are not a tenant; if anything you are your boyfriend's "subtenant". So his room mate could start evicting you, in part depending on how the lease is drawn up, which an attorney should look at. In situations like this, however, people in your position are normally considered like month-to-month tenants and therefore "30 days notice" is required. If you are not paying any rent, the 30 days could fall on the day that is 30 days after notice is served on you, or from some other date. Again without more information that is hard to say but that is in part the landlord's dilemma, which may become yours when it is served. How nasty things get before then, however, is an entirely different story.