What are you referring to specifically? If buyer is trying to terminate the transaction, due to inability to get loan approval...then yes, it's entirely reasonable for the seller and listing agent to ask for proof from Buyer's lender that that is the case. Buyer and seller have entered into a legally binding contract. The seller is taking a risk by accepting a buyer's offer, and essentially taking the property off the market while buyer does their due diligence. If buyer terminates, there needs to be a good reason. If buyer is just having cold feet, and it's not due to loan issues, I'd say seller should keep the earnest money. By the way, you really need to be asking your agent this question.