Legal Question in Landlord & Tenant Law in Illinois

If the ex- is going to sue you the ex- is going to sue you, and all you can do is produce whatever documents you have to prove your point. Signed agreements were not necessary if a court can piece together what amounts to an oral partnership to share the apartment, so think about how you two actually did handle things and double-check your accounting. You should also get an itemized statement from this person detailing the reasons for the monies owed. For instance if it's a portion of the security deposit because the landlord claimed the apartment was damaged then you may be responsible under the above "partnership" theory or you may have just caused the damage. But it is your roommate's responsibility to detail what is being demanded and not just call around demanding money without some kind of detail. If the ex is not helpful the landlord may be able to give you the info you need. Otherwise as to calls hopefully your family is backing your version of the situation. It is somewhat cowardly and immature for the ex not to deal with you directly and fairly.