Did you sign any paperwork with the realtor? After all, if they took 1% escrow from you I would have to think that you received some paperwork from them and it will probably tell you about how to deal with offers (and probably that they aren't binding unless everything is contained within a signed writing, including a contract of sale).
It seems that you agreed to terms with the realtor and that the realtor relayed terms, ostensibly yours, to the seller. However, there was never any actual agreement between you and the seller regarding clear and unambiguous terms and the seller had little involvement. From reading what you write, it would seem unlikely to me that you had any agreement that the courts would recognize, especially without a writing binding the seller.