if a bank emplyee breaches a contract by giving your account info to others without your consent or knowledge can i sue the bank? i

An employer is responsible for the actions of its employee within the scope of their employment, so to the extent that the teller did something wrong, the bank would be responsible.  However, you don't say how you were monetarily damaged by what the teller did.  In general, although there are exceptions, it is not enough to be able to prove that someone did something wrong, you have to be able to show that you lost money in some way because of that wrong before you can win a civil suit.  It is likely that the bank's breach of confidentiality breached one or more banking statutes or regulations, but unless those statutes authorize recovery even without monetary damages, I'm not sure you have a case.