The listing Agent may provide some insight as to why the deal did not close, but not always. In most cases it is due to Buyer financing and not a problem with the property. It could also be the result of something that turned up in the inspection that was a deal killer for the Buyer.
In most cases however, the offer price will not be disclosed. Remember the listing Agent is working for the seller and their job is to sell it for as much as market will bear. So they will be hoping for a higher offer from the next Buyer. Disclosing how much was accepted previously will likey bring in a lower offer then before.
I recommend finding a reputable Agent to help you with your home search, so you have someone looking out for "your" best interests.