You are all jointly and severally liable unless you had an agreement with each other that the landlord also agreed to. You can sue your roommate who is not paying for his or her share of the rent which is due but not for all the rent ulnless there is an acceleration clause in the lease. I would always recommend an agreement with all the tenants before signing a lease. In this case a default by any of you unless cured by the others is a default by all.
Answered on Aug 11th, 2014 at 1:53 PM