Cosigned for a car that got repossessed..?

another party was responsible for making payments yet failed obviously and got the car repossessed. As far as i was told (Wells Fargo Auto) would contact me regarding what i owed/what the car sold for, all that good stuff. As i wait, and wait months with no contact from Wells Fargo/anyone for that matter i find out that the responsible party has known the balance after the car had been sold months prior and attempts to make contact with him were made several times... BUT NEVER EVER TO MYSELF who is the Co Signer! If the responsible party fails to respond shouldn't they have at that time (late anyways) tried to contact the co signer for the account in order to resolve the matter? Still, i have no idea whom to pay, how much, NOTHING!! Is this fair?? I am the co signer and i should have been contacted 1st if not atleast an attempt been made to let me know the status!?