Can a tenant be forced to stay on their lease after it expires if a roommate chooses to stay in the unit?

Question Details:

My roommate and I have a 1 year lease that ends at the end of next month. She wishes to stay in the apartment and I do not want to stay beyond our rental agreement. (However, she would have trouble paying the rent by herself and is having a hard time finding a roommate). When I informed the property manager that I am moving, he told me that I am still liable for the lease unless my roommate also moves or finds a new roommate. This is not listed in our rental agreement. The agreement states that we signed a 1 year lease with the option of going month-to-month when the year is up. Important Notice