[Norm K]

Depending on the laws in your state, dealing directly with the listing agent means you're essentially unrepresented. The listing agent will owe you nothing more than fair and honest dealings while his fiduciary responsibilities lie exclusively with the seller. This could result in you not receiving material information that you would have otherwise been privy to.

If all the buyer's agent did was show you the property a couple of times then you have no legal responsibility to him, unless, that is, you signed a Buyer's Agency Agreement with him. That said, you contacted him, questioned him and consumed his time. I doubt he's any more excited to work for nothing than you are.